Maybe the ported vacuum advance fitting is not tight. That would be a significant leak, and the brake cleaner may have essentially choked out the engine.
But you say it's been running rich. A vacuum leak at the base of the carb should make it run lean.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.