[WFBowen]

Scutty:
I'd definitely get a new distributor in there as your current one might be shorting, especially under advance plate movement. As you mentioned, you might as well stick another coil in there while you're at it & double check all of your wiring for loose connections, etc. I wouldn't be revving the motor too much until you're sure you've got this problem licked - high speed miss can cause a lot of things to come unglued, especially in an aircooled motor. Are there problems in other electrical circuits?
Good luck,
Bill.