I just bought a 90 roller yesterday that the previous owner swapped a sn95 front end, sn95 rear into and then was in the middle of installed the old school 95 cobra 4 wheel disc set up in and sold me the car. The calipers are red with the white cobra lettering. My question is can I use the stock brake master cylinder and brake booster, what do I do to hook up the e brake handle correctly and he handed me a summit adjustable brake proportioning valve he said I needed to use to adjust the pressure going to the rear brakes. Can someone point me in the direction how to finish this set up? I've had a mustang for 12 years prior but it was 4 lug I never messed with 5 lugs or anything. He also mentioned I had to shim the front ball joints to line up? Thanks in advance !