well, heres what i did. 350 .030 over, 9:1 comp, holley 700cfm dp, 10"3000 stall, crane hyd. .480/.485 230/235 at .050, 28x10 slicks, ported 441's, extremly under geared 3.42's for those slicks, ran a 13.2, and on 215/70/15 street tires it was a 13.5 no traction at all esp with the converter! ps. my motor dynoed at 375bhp at 5700rpm and 401lb ft at 4200rpm, that was engine dynoed. with the 4.10's and the slicks, im gonna see if i can smash into the 12's with the old combo before i add all my mods. p.s. i was running the traps at 4500rpm wow! lol now with the 4.10's it will be pulling at 5200rpm thats a difference of pulling with 330hp at 4500rpm and 370hp at 5200rpm, should make a big difference in the top end. i see 12's in my future with that combo =) oh and my heads flowed the same numbers as a set of vortec's with bigger valves, mines got the 2.02/1.60's in it. ( i know this cuz they were flowed too)