Alan
I've subscribed to Car Craft for years. It goes in cycles of having very good DIY articles to articles where they just open a catalog and throw a bunch of money at a car. Right now they seem to have a 50-50 mix of the two, maybe a bit heavier on the DIY tech. Relatively speaking, it's fairly inexpensive for a subscription.
I let my subscription to Hot Rod expire. It has really turned into a picture book. And, when they do have tech articles, most of them are watered-down versions of what appears in Car Craft.
I used to get Auto Restorer. It used to have a lot of good info on how to fix old parts, especially parts that you simply cannot buy repro. I let it expire because the price was going up while the tech articles were either becoming lighter or focused on vehicles before my flavor (40s and older).
I also currently get Muscle Car Review. While it does have some good tech articles, it is mostly a picture book (not a bad thing necessarily, if you're looking for that). And, as you can guess from the name, it is strictly 60s/70s American heavy metal.
In the past, I have also subscribed to 4 Wheel and Off Road. Completely different slant from cars, but it has (or had) great tech articles and the engine-related tech translates directly to cars (we're all after the same thing...more power). Plus, I appreciate the home engineering that goes into some of those rigs.
Some of the Mustang-related magazines are also pretty good with tech articles. I've never subscribed to any of them because they can be a bit redundant (it's a 5.0, there's only so much you can do to it), but they do tend to provide good information and also wander into the Windsor, FE, and Mod motors.
I'd recommend taking a stroll through your local newstand (even if it is the B&N at the mall) to see if anything strikes your fancy. That's how I've run across a lot of magazines. Being an editor, I'm pretty good at judging what to expect from subsequent issues by flipping through a couple of issues on the stand; you can do the same. Hope this helps a bit.
Eric