Is this street or race? What kind of blower? as pat said is it teflon stripped? the 660's will choke the blower. I believe everything Pat says, but a lot of those 'h' beam rods are good for about 500hp so be careful when spec'g the stuff, look at scat and make sure thier rods will live over 800hp. If that is a good quality blower and you can't part with it i'd build an old school 427 tall deck.