The ZZ4 is perfect for the 1st gen camaros. I run a ZZ4, 700R4, 3:55, 750 holley, Hooker ceramic coated headers, which work fine with the angled plugs. I just installed the LT4 "Hot Cam", along with Comp Stamped roller tipped rockers and a pete Jackson Gear drive. It was a lot of work, mostly because everything always needs a little tweaking. This car really rocks, it gets more attention for the way it sounds (with the dual Flowmasters, etc.) than just about anything else.
Adjusting the Valves after installing the rockers is a walk in the park. The instructions tell you what to do, but the easiest way is to turn the engine over until both valves have just closed. Tighten the nut until the pushrod won't rotate with your finger, tighten 1/3 to 1/2 turn more. It's work for me for longer than I'm willing to admit.