Good job on the stuck valve. That's an indication that gas sat in the intake plenum long enough to varnish up and freeze the valve stem to the guide. That may also be a clue to the idle issue (varnish partially restricting an idle circuit). Of the close to 100 corvair carbs I have rebuilt, there have been probably 5 or so that, despite my best efforts, I have not been able to get to idle correctly. Jeff Williams at California Corvair does a great job rebuilding carbs. If you don't want to keep dancing with your current carbs, it might be a good idea to buy at least one rebuilt carb from CA corvair and play musical carbs. Also, I've found corvairs idle can be sensitive to timing. Sometimes a difference of a couple degrees can be the difference between idling correctly and bad idle. Good luck. I'll be interested to hear what corrects the idle issue.
Ah you’re lucky! My ‘65 had a dropped valve seat so the head had to come apart and be replaced. Does that dash sticker say that this hasn’t been on the road since ‘98??!
