I'm very late in my response so I apologize for that first and foremost.
Still haven't fixed the issues. It's not my daily driver and my wallet says to wait a bit before purchasing anything not a necessity.
The pistons I have are standard pistons so I would assume they are somewhat dished.
Where would I find the casting numbers on the heads?
What would be a better fix? New heads? New valvetrain? new heads and new valve train? New cam?
Another problem I'm having is it seems to be pulling the choke by itself. I've googled it every way to sunday and can't figure that one out. I should have just put a cummins 4bt diesel in in the first place.