[andy669]

Its possible that the distributor has had the weights removed and they were just running total timing. Its kinda hard to guess on jet sizes without knowing whats been done to the emulsion circuit. You said someone had worked on it, thats usually the first thing carb guys do. A bigger emulsion circuit will want a bigger jet size.

Get rid of that mechanical pump and put a good electric one on it. Try to get the A/F down to around 13.5.

Andy