OH MY and HP to boot!! the rockers and push rods are all interchangeable!! the Ps will add compression ( which is low end) and flow ( which is mid to top end) SOOoooo... It is a killer choice on the 84!! Header problems are not really that bad... a smaller plug or a ding in the header tube is good enough and a different angle plug boot ( and your changing wires anyway... right??) and your rocking!! Have fun!! Oh.. while the heads are off... gasket match the intake to the intake gasket and also the heads... just a little more power!!