My combo is almost identical to yours, and I'm going with 4.10's. My car is not weighed yet, but should be around 36-3700lb with me, 511, 10.5-1, cnc stealths, 262@.050 solid flat tappet, holley sd intake, 950 quickfuel, 9.5" PTC 4200, 2" TTI's, 3" x pipe and ultra flos and 295/65 drag radials. I don't plan on any cross country trips, but I can still cruise 50-100 miles if I want without much hassle. I don't mind cruising in the granny lane if necessary. I would rather be better prepared at the track BTW, did you dyno your engine?