thanks for all of the input guys. the seats and guides(3/8) are new and was trying to get the cost down for such a basic build. i thought about going to chevy .300 longer as an option but that would entail new guides and then new valve job. the ferrea valves with 3/8 stems were about $28 a piece so then that adds up after that. the only 5000 series were available only in the exhaust and not the intake. i need the long valves for this application or the choices would have been more abundant.