Putting head on slant six

Max; head bolts = 65 ft lbs
rocker shaft bolts = 25 ft lbs both #s from a 1971 manual

The way I've always done it is to clean the valve face with choke cleaner. Stick the valve to the rubber cup. Put a dab of compound on the valve at the 45 angle surface. Smear it all around the valve. Stick it in the head. Make like an Indian starting a fire and push down lightly while the valve is turning back and forth. After about 5 times, lift the valve a little, and go a quarter turn, and repeat. After a minute or two, pull the valve out, wipe it clean, and wipe the seat clean. Inspect both. Some require more lapping than others.

U tube must have a video.