Update
ScotI- unfortunately, I don't have the original motor.
Well, I've tried a couple different flywheel weights recently with no luck. The original 156 gram counterweight seems to be the best and the other weights (heavier & lighter) caused the vibration to increase.
So, at this point, I'll just cruise around until winter. Doesn't look like I'll miss many/any autocrosses this summer with COVID hanging around. Then, I plan to pull the engine and have an internally balanced rotating assembly installed. As long as I keep the rpm's under 4000, the vibration is not that bad. I put about 40 miles on it yesterday cruising back roads.
I still have a few small details to finish (AC charge, alignment tweak, etc) but overall, the car is "complete."
I'll post a few gratuitous photos for grins.
Daniel
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