Reply to "big brakes"

With 18" wheels, you'll have no problem with any kits. The factory big-brakes were huge iron 3-piston Girlings & thick vented rotors used on the GP-4 LeMans cars & later made an option on GP-3s; they became std on the GT-5 series in '80. They're expensive because DeTomaso sells them directly or thru Wilkinson, but they are complete & do bolt on, even the weird pliers-action e-brake system. I added them to a home-made GP-3 car in the mid-'80s; the kit included 4 complete suspension uprights fully assembled with Aeroquip hoses. A 4-hr job & many $$$