I`d use the alum. caps and girdle if I already had them. I know a guy that built a 500" duster, (my ex partner was in on it ), he had to go to alum.caps, and back the throttle off to make his live, he backed it of to 9:60`s . I don't remember how many blocks he broke, even one of the aftermarket jobs ! Just make sure their set up right .-----jmo
I haven`t had my engine on a dyno , but the best three engine programs say 755 h.p. w/ my cam change /down from 761 . /// WHO REALLY KNOWS----
