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Hey there Boatdetective, first thing I'd check for is a vacuum leak at the base of the carb and or the vacuum advance line to the distributor. Pretty reliable setup built for the long haul also new gas?? Carb may need some tweaking with a vacuum gauge. Easy to do on these. :popcorn:Paul B.
If it is a 3 on the tree, be sure to have a coat hanger handy to un-jamb the shifting linkage.