I'm running a 454 bbc with a b&m 250 on my 27 cyclone.my dyno came in at 692 hp, mind u alot of aftermarket internals, but she does love exploding b1s defintly wanna upgrade if u go that route

454 mag bottom end AKRacing heads 8.5 static cr 177 blower 731 cam. 650 up all day,. With a 250 blower and dual carbs no problem