hi don.all i run in my cuda is factory stock stroke 340's.one of my combos is ported w2's flat top's at 10:1 comp solid street roller .550 lift 242@.050.victor w2 intake 800 thermoquad.17/8 hedman headers.low gearset 904 trans w 5000 stall 8 inch converter.4.86 83/4 rearend @ 3100lbs went a best of 10.39@ 127 mph.that thing sounds like a stock 340 @ idle with lots of vacuum but has torque like you wouldn't believe from a 340.very streetable.