I just put the heads back on my car('94 LT1 Camaro). I followed these directions on adjusting the valves I found:

"To adjust your rockers. Turn the crankshaft clockwise until the cast arrow on the crankshaft hub is in the 12 o’ clock position and number 1 cylinder is at TDC. Watch number 1 cylinder valves as the crankshaft hub arrow approaches 12 o’ clock position. If a rocker moves as the arrow moves to position, the engine is in the number 6 firing position. The crankshaft must then be turned one more time to reach cylinder number 1 firing position.
At this position, exhaust rockers 1, 3, 4, and 8 can be adjusted as can intake rockers 1, 2, 5, and 7. While spinning the pushrod with your fingertips, tighten the rocker down until you feel resistance in the pushrod - this is zero lash. Tighten the adjusting nut on the rocker arm an additional 1/2 - 1 turn.
Turn the crank 360 degrees (clockwise) until the crankshaft hub is at 12 o’ clock again. Adjust exhaust rocker 2, 5, 6, and 7 and intake rockers 3, 4, 6, and 8 as you did in the step above."

I drove the car last night for the first time. I took it easy on it. It ran good, but I could hear, just barely, some valve clatter and it sounds like one of the rocker arms on the pass side is making a little more noise than the rest. A louder swishing sound. Is there a more precise way to adj the valves(ie feeler gauge)?