To add to Roger's component questions, you talked about the GM vs Ford nomenclatures. One of the things you'll learn is that the parts are attributed to a basic design from one or the other, but if the parts are from an aftermarket supplier, like P&J, they can, and often are, revised/modified. So, "Mustang" brakes in the hot rod aftermarket aren't literally from a Mustang but rather based on the Mustang specifications. Mixing original design components is no problem, in fact, it's the essence of hot rodding. A key idea on the brakes, regardless of your eventual choices, is to make sure you get the same wheel bolt pattern front and rear. You'll likely have very different sizes of tires so won't be doing a normal "rotating" procedure, but it's just nicer to have some uniformity when buying wheels, for instance.