What does the car use for a lever? In my truck, '37 1/2 ton, I have a turbo 350 automatic with a Lokar floor shifter. I mounted the OEM style park brake lever off the side of the Lokar shifter bracket. It only took a couple of holes, bolts, and a few spacers to get it to align with the brake rod that runs towards the rear axle. At the axle I had custom cables made with '37 ends on '79 cables. The Trans Am rear axle uses standard drums brakes with pull cable parking brake set up. I would think building a bracket shouldn't be all that hard.
Joe