if you stay 440 get a heavy block. i got two and used the first for my duster.i cracked a 73 block in 50 or so passes low 10s. i do not have the car to run in the 9s or the want as of now so i got a 440 source stock stroke crank because after the girdle and stuff to not brake a block the 40 year old crank was not going back in.
if or when i brake these i'm going to a 400 block. mains on stock .375 at the thin spot. 440 6630 heavy is .511 and wide supports. the 400 is .550 and wider supports than the 440 easy.