Randy: I am leaning to a 400 block with short fill, aluminum caps,440 source girdle, line bored, bored to 4.375, 440 source 4.25 crank with 2.20 rod end, Aluminum rods, Ross 14-1 pistons, Comp .690 roller, bush all lifters holes in block. B-1s with max port. This 511 should make 1,000 h.p with maybe alittle more after tuning. Better have a great trans, driveshaft, rearend, and axles. Birdtracker+