Well at least you have one favor on your side, you have GM product so, there is set-up's for day's for you car. Since I have a moper, it was kind of frustrating when I was doing the brakes on my charger. Of course now they have all the parts I wanted.
If you look at WILWOOD and BAER, they both have kits for cars still using 15" wheels. On the cost side, at least look at this way, you are making your car safer, like with the cage and so.
On your car, I would lean more towards BAER. Thier system includes all the parts you need. Spindles, caliper, Master, etc..
whoa digging the pic of the car!!! I understand what your saying about brakes etc and bringing it to our attention . I wish you luck with what ever you do with that beast. Brandon