If you want to do a little work to get it to all fit, you could swap out your entire control arms, and brakes to the 86 to 94 C4 Corvette Aluminum control arms, aluminum brakes. and even go a liittle further and buy a master cylinder adapter from Master Brakes and use the lightweight aluminum master cylinder and booster.
If that isn't enough, you can them with a little work to fab a bracket to hold the caliper mount the aluminum rear brakes from the same car onto you housing. The fitment is easy to do.
If you did all I named it would sve you several hundred pounds and give superb stopping with brakes you can buy parts for anywhere.
Ed