1973 225 valve adjustment help!please!

The safe way to adjust ANY engine with solid tappets is to rememsber

EOIC

Which means

Wrench/ bump the engine around until


the EXHAUST valve just starts to OPEN, and adjust the intake on that cylinder

wrench/ bump until

the INTAKE has opened and is almost CLOSED and adjust the exhaust for that side

I usually pick a feeler "at spec" and one about .002-003 larger, adjust until the "spec" goes in but not the oversize