You have enough ignition that the plugs should not have any color on the porcelain. If there is color there, it’s rich at idle, and I’d probably say pig rich.
Impossible.... or so I thought. I changed the carb and the problem was still there!
With the first carb (Holley hp 850), I leaned out all 4 corners until it would barely run, but it didn’t help. So I switched carbs and the same problem was there. But... I never took the time to really lean out the idle screws on the new carb. I did so yesterday and the problem seems to be gone. I am only cautiously optimistic, because the problem has always seemed worse in hot weather and it is cold today here in Buffalo today. But if my memory serves me correctly, even last fall it would still backfire on cool days at least a little bit. I had no backfires today! I need to get it out and drive it some more to be sure it’s good, but first I need to get it inspected. Thanks so much to all of you who gave your expert insight and advice. I think I am back in action again!
-Jay
