Hi vega. Just read your post, hope this helps you. I run a 77 280z 2900lb with driver no bumpers everything els is there. It does have a roll bar. 408sbc 10.9 comp 93 pump gas motor that makes 500hp @5600rpm and 518tq @4300rpm at the crank. turbo 400 trans 10" converter 3500stall manual vale body. I have not used trans brake 2 step or the 275hp nos kit yet. Keep breaking cv axels useing 255/60/15 drag radials. So far its managed a best of 10.85 at 124mph traction not a problem, broken axels always a broblem. The diff is welded to. What ever combo you decide to use 500hp at the crank should put you in the ball park.