[750hp]

Ron,
These heads will give a moderate performance improvement for your engine. The weight savings will be nice, and you'll probably pick up a real-world 40hp with them (over standard iron heads).

They use a standard bolt-on rocker, so you won't have to machine them for screw-in studs.

Like David said, you might have second thoughts about these heads when you price up all the extras. Depends on how cheap you can get these heads, it might be worth waiting for some omplete Edelbrock Performer RPM, or the 165 Canfields. It's usually a better deal to get the heads fully assembled, with the spring rates to suit your camshaft.

A couple of things :

Machining the heads doesn't affect your camshaft specs. Reducing the chamber volume of the heads increases your compression ratio, but your camshaft lift/ratio/duration all stay the same. Changing rocker ratio affects your overall camshaft lift. Your engine capacity also remains the same.

Camshafts are either roller or flat tappet style. In each of those styles, you can have either hydraulic or solid lifter style.