I have a 1971 Duster with a 518 low deck pump gas stroker with a 4.10 Dana 60, I run a 8 inch T/A race converter in it(not built for this motor or car ) and cross the finish line right at 6500 RPM using a set of 29x12x15 Goodyear slicks(91.5 inch circumferences at 15 lbs pressure) It has ran a best of 1.42 60 ft. times so far and 10.31 ET on the brakes, the best MPH off of the brakes was 129.+ MPH at WOT. I wouldn't hesitate to use a 4.56 in your car, I do use a low gear set, 2.77 to 1 ratio, in my 727 trans so it shifts into 2nd and 3rd gear sooner than it would with the 2.45 stock gear ratio My motor is 10.8 to 1 compresson wuth a custom grind Comp Cams solid roller cam that is 260 @.050 on the intake and 266@ .050 on the exhasut with right at .700 lift at the retainers on boh sides. The motor likes to rev past 7000 real easily, I try to shift it out of 1st gear by 7500 and out of 2nd by 7000 RPM but sometimes I miss the shifts points according to my playback tach and O2 system, it(O2 system) stores RPM as well as AFR for the entire run The motor has a set of M.W. size Indy SR heads with a set of T&D 1.65 ratio rockers and a Indy 400-2 intake with a Holley 850 D.P. carb.The car is heavy intentionally(3450 lbs wet w/ me in it) as I made it for a street car, not a "race" car IHTHs, don't forget about tire growth if your using a bais ply set of slicks. The little motors(stock stroke 440) need more gear multiplication on the starting line as well as the entire way down the track then their bigger stroker motor brothers do