Bill
You have a lot of variables there and there are a lot of small changes that will make big differences when you choose which pedals and master cylinders.
I prefer the swing mount pedals for two reasons, fist it keeps all of the mechanicals up off the floorboards, this may seem inconsequencial, but stuff gets really dirty in those hard to reach places like a footwell, second, you will definitely need residual pressure valves in your lines being that the master cylinder(s) are below the calipers. The tiltons have them with the kit if you choose to use them.
Also, most floor mounted pedal boxes have a smaller ratio than swing pedals, this make for more brake effort, or less pressure for the same effort...translation, less braking power.
The swing pedals typically have a 6 to 1 ratio versus 4 1/2 or 5 to one on the flor mounts, and this can make a lot of difference.
Whichever you decide to go with you will probably have a balance bar between two master cylinders, and you will want as much force for your foot pressure that you can comfortably get, as the pressure is basically divided between the two, depending where the bar is set.
A decent foot pressure for stopping is about 75 lbs., with around 100 lbs. being a hard stop, and about 150 lbs. a panic stop, you can multiply these numbers by the pedal ratio and that will give you the input to the master cylinder. Take the diameter of the master cylinder, divide by two, this is the radius.
For instance, a 1" master cylinder has a radius of 1/2", the formula is 3.14 X Rad. X Rad. or PI x Rad Squared, this is the square inch area of the piston, now divide this into your force at the master cyl. and it will give you the hydraulic pressure of the system...typically I try to get a max of 1000 to 1200 PSI, this seems high, but it is easier to have the pressure if you have to back it off some, much harder to add more.
Also, find out about your caliper piston sizes, this will tell you where to start as far as master cylinder sizes. I think you will probably need somewhere around a 7/8" master, but if you do the math you will see that a 1/8" change in diameter can make a difference of 30%, so as I said up front small changes can make big differences.
I have used 3/4 and 7/8 masters with no booster and have not had any problems with stopping, just be careful with the smaller cylinders as I have seen some backyard setups where the calipers were actually spread apart and even split from too much pressure. I recently had a car with too small a master cylinder, and the pedal felt like the cylinder & lines were airbound, actually the calipers were spreading, Not good!....we replaced the master with a 7/8"unit and got a hard pedal with great breaks.
Good Luck
Phil
