Let me answer Roberts questions first.
What you described in the first question is mirror imaging. You gotta have it or the image is reversed. Think of it this way. You look out the back window and a car goes past you on your left side, but to the driver looking into a mirror it goes past on the right. Which would you rather see on the video screen??? Right , or left. That is what is called mirror imaging on a monitor.
Ask anyone with a forty how the vision out the rear cabin window is. They will tell you it is lousy. Blind spots as big as a mack truck whether you have a carb or injection. It doesn't matter. That is one reason they put the side mirrors on, to help with rear vision and the blind spots. Trouble is they are small mirrors. Some cheat with the convex lens. This helps the field of view, but it makes the images seen smaller and the distance factor is terrible. "The image seen in the mirror is closer than it appears" I wrecked an 85 Lotus Esprit because of that very fact when I couldn't tell where the guy in the next lane to me was. I was trying hard to figure it out and didn't notice the truck in front of me had stopped for the red light.
As far as the injectors is concerned I think it won't matter whether you have vertical or angled injectors. My injectors with tea strainers on them are not that much in the way. The limiting factor isn't the mirror, its the rear clip. The plexiglass opening is what creates the blind spots. With the rear clip off the view is great. Now when I add some real filters to my setup that will really block my view.
Now lets talk about cameras and monitors. Any reputable seller out there will mix and match cameras and monitors to give you what you want. If you want one camera they got it. Three, they got it. Four, they got it. CCD is the way to go. It gives you a television type screen to look at. The CMOS units will look a little green on the screen. They are a little grainy even though they are color. It isn't distracting at all, but remember CCD is pricey. Most multiple systems(CCD) will run north of $400. I ran across this article from an ebay seller of rear camera systems back when I was looking. It still holds. If he is on ebay still, he is one you can deal with. Straight up guy. I will add that if you choose anything better than a tag camera, don't go over 120º. 90º is perfect but you will pay for that convenience.
eBay Guides - EVERYTHING YOU NEED TO KNOW ABOUT REAR VIEW CAMERAS
If you Google rear view cameras, you will get 12,000,000 hits.
This group does a good job of giving you choices. After reading the above be your own judge. They have videos explaining their products and how all are interchangeable.
Backup Camera | Rear-View Camera | RV Backup
Here is another good group.
Backup Camera System | Vehicle Safety Products | RearViewSafety.com
Multiple camera systems,
Backup Camera System 3 Camera Setup | RVS-770615 | Back Up Systems
They offer a "black box camera" which is a continuous loop camera(when the chip is full it records over itself. It is setup with some extra monitors like limited GPS, G force etc. The video is top notch. One of our forum members picked one up for about $99. He sent me a video he did and it was great quality. A second camera can be added to this I believe.
BLACK BOX CAMERA SYSTEM | RVS-300 | REARVIEWSAFETY.COM
DVR single or multi channel
4 Channel Mini Mobile DVR | RVS-870 | Rearviewsafety.com
Want to go on the cheap
Wholesale Rear View Cameras - Car Reversing Cameras and Rearview Systems - Rearview Cameras from China - Car Video
And there is always Ebay
rear view camera | eBay
I would say that when you look around, take notes or save the pages to a file on your computer so you can compare them. There is a lot of information about these units and some of the differences are subtle.
What little advice I can give is this. If you put a tag camera on your car at the level of the tag, you won't see anything much except for backing up. The camera has to be high in order to see anything "around you"
Any of you wishing to talk more about this give me a call and we can discuss some of the finer points a bit more. I don't answer my phone at work, but you can leave a message and I will call you when I have enough time to talk.
678-687-4611
I am no expert, so don't think I can give you the final word on anything you are looking at. I have looked at most of the "systems" out there. Some are better than others. My system leaves a little to be desired, but you don't need the greatest out there to accomplish what you want unless you are one that wants to have the best
Bill