here's how I do mine with a roller, it helps if you have the balancer with the markings
Valve Lash Adjustment
1. Position engine at top dead center (TDC) on #1 cylinder in firing position.
Adjust intake valves on #2 and #7 cylinders.
Adjust exhaust valves on #4 and # 8 cylinders.
2. Rotate crankshaft 1/2 revolution clockwise.
Adjust intake valves on #1 and #8 cylinders.
Adjust exhaust valves on #3 and #6 cylinders.
3. Rotate crankshaft 1/2 revolution clockwise to #6 cylinder in firing position.
Adjust intake valves on #3 and # 4 cylinders
Adjust exhaust valves on #5 and #7 cylinders.
4. Rotate crankshaft 1/2 revolution clockwise.
Adjust intake valves on #5 and #6 cylinders
Adjust exhaust valves on #1 and #2 cylinders
Reinstall valve covers and connect power to the distributor. Start engine to check for loose valve lash