Stroker!!! my 408 was mild at 9.8 to 1 compression for pump gas... R3 block , 600 lift mech.cam , and Indy 360-1 heads made 539 hp and 502 torque .. the amount of torque is what impressed me ! it ran 10.60s in my Dart until the Eagle crank cracked .. imo stay away from cast cranks , as said my combo was mild but had potential to run way faster with a little head porting and a roller cam. With the amount of torque it made I was able to use a 4.10 gear ... it 60ft'ed the same as my non stroker 367 with 4.88s