robsbird,sounds like you should check the fash on your converter to see where it stalls at or go to a trans break.I race a 2600#monza w/driver with a mild 400+hp355,th350 with 4500 stall converter,4.56 rear 33-15-15 d5 goodyear@6#air,ladder bar set in the center hole.I leave at 3500 on a 2step my 60ft's are 1.430 and 1/8 6.86@ 98mph and 10.96 1/4@ 120mph RM1, check out my profile