Finally, my first 360 and goals for it! I'll be asking a lot of questions.

Sealed power/federal mogul etc., they are listed w/the std. valves w/a notation usually. NAPA, SBI, Engine Builder, use the net to find the std. replacement, then see what they
have available o/s, if any. I don't really do "stock" rebuilding of heads, so if the guides are too worn they get replaced.