Thanks for the posts. I have tried to rule out all the simple things. Tightening the valve covers seemed to slow it a little but I still don't think that is it. (Just wishful thinking).

Assume it is the intake with a slow leak in the front driver's corner. Is there any alternative to R&R'ing the intake? As you know with an FE, that means rocker arms, resetting valves etc. Is there any hope of pushing some RTV into front corner or anything I can do to save a weekend of work?