Heads were done by local machine shop who did rest of machine work on motor along with new seals. They said guides were ok, but since then, I have run into 2 other people who had heads done there and they had smoking problem. They had them redone and were fine after that. Thes were chevy heads though.
It isn't consistent though. One time it's left side, then next is right, but mostly right. Just enough that it is annoying when sitting at lite. It is
oil as smoke is blue and there is deposit on plugs. Some one else said rocker arms shaft that is upside down will do this also. this is my first FE motor so don't know what to look for.
Was also told that intake may be leaking but car idles ok. Did restrictor thing in head before it was assembled. No smoke on start up, just after running and coming to stop at lite.