So since you haven't done much from advice given-I'm sorta like ?????? But if you want to specificly follow some suggestions step by step in an A B A type order?????????

First , lets just disconnect the PCV completely to see if the smoke is from it sucking in the oil???????? And while its disconnected, see if any oil fumes come out of the breather cap????

Do you have any pics of when the manifold and valve covers were off the heads???????

What type seals and guides were used????????