[vector1]

somethings to think about, the shp block will put an additional 40# on the nose. do you have the drivetrain, exhaust, bigger air breather, larger carb, brakes capable of handling the increased wt. and speeds? if not the 408 would be the choice. you can put a 454 in there but if you can't get the air in or out to make the power and keep it cool you won't enjoy the results. figure out how much cfm you can put through your air cleaner and carb and out the exhaust and tell us what you come up with.