One thing I would do before I went to too much trouble.....
Yank a valve cover off and see how much
oil is going to the top end when you give her a little gas...
I like to run about a .065"
oil restrictor to the cylinder heads on the FE's....otherwise you could get a whole lot of
oil up there. You could possibly have a flood under a full throttle condition and it would make it easier for a valve seal to suck a little oil down.