[tubman]

In your last post, you said "I do have a 2 piece valve guide with the mushroom stem". I have never seen two piece guides and mushroom stems on an 8BA. I have seen the 8BA pieces used in an earlier engine, but not the other way around. Perhaps someone had the earlier parts and used them in a late engine to save money.

The usual practice is to use the 8BA valve setup in all flatheads, as it is better all around and easier to work with.