I've cleaned out the air injector crap on the driver's side fender, new air cleaner, plugs, wires, dist cap, rotor, new rebuilt carb, check the valve clearance, timing seems to be okay, egr seems to be working fine, the intake manifold isn't cracked... WTF?! The only thing that I can think of that could be an issue is that my cooling system works really, really well, and the temp guage never gets to the middle - it's always about a quarter of the way up in the winter, a third of the way up in summer. I put a new radiator and thermostat in it last year after the org crap gave up...could that effect it? is there a computer control on the older 60s that uses engine temp to control fuel mix? (not that that would make sense at all...) What about the flap/vlave that opens and closes inside the exhaust manifold that redirects hot air up toward the intake manifold? Could that be a problem? I'm running out of ideas here.