Heads (IMHO) are the best money spent for adding power to a SBC. After doing mucho research I opted for Chevy Vortec heads. Alum heads are more expensive and unless you are shaving tenths off at the dragstrip, really not worth the expenditure. Vortecs will get you into the 9.70 compression and still be pump gas freindly depending on your cam. I would recommend a Crane cam.
These heads require a Vortec specific manifold, I recommend an Edlebrock RPM Airgap or the Chinese knock off. A Holley 650cfm for the 350, and a 750 for a 383. You will also need centerbolt valve covers. All of your accessories will bolt right up Alternator, power steering pump. You will also need self aligning rocker arms Roller or stamped steel. Your original pushrods and lifters will work. If you go with 1.6 ratio rocker arms be sure and check pushrod length and valve to piston clearance. A regular HEI or orginal dizzy works fine. Exhaust system will bolt right up.
If you are running a Cam of 470 lift or higher you will need to upgrade the springs. Scoggins Dickey sells a set with spring upgrade.
I have built two engines with these heads and what a huge difference they make.
