Bonanza, There is some talk of the Vortec's a couple pages back in Engine/Drivetrain, It covers them pretty much. The basics are you need a new intake, rockers, pushrods, bolts, ect. Yes they are a good improvement, however due to the needed other parts, sometimes it's better to go with another "standard" head. Check out the other post, If you have any questions, then post again & someone will help, Lorne