I recently put a new head on my 60, runs great but has a somewhat shacky idle, today I went out and went thru everything- compression is good, retorqued the manifold, and went to re-adjust the valves-they were all fine, did the lean drop on the carb( as best as I could), and went thru the FSM on the emisions systems,( EGR system disconnected too), it's like I said a little shacky and inconsistant-not like the typical vacume leak that has that oscilating rpm change, i'm stumped, it's not real bad but something just doesn't seem rite to me, Just how smooth should it be?