Johnc, your 460 is a durable engine with a 429SCJ cast iron manifold that performs extremely well.OMC installed the last remaining SCJ manifolds on this engine to boost HP and these manifolds no longer available readily.I've had Edelbrock,Offenhouser etc.manifolds on the Ford and none performed better than the cast iron unit.Don't waste your money on intake,invest in a better exhaust manifold instead.The SCJ man has huge runners that don't match the smaller 460 heads but don't worry about that.The other good manifolds match better yet they didn't produce higher RPM's or acceleration.Your drive would be my only concern because they seem to dissapear from the market.They were derived from the V8 outboard model wich handled 500HP.I guess if you careful it should give you longevity.Up here in Canada it seems to be a hassle to get parts in a hurry.