It does sound like you are getting, or have debris in the float bowl. If that is the original tank, I would be sure to put a filter between the pump and the carburetor on the pressure side of the pump. I agree with LarrBeard, a carb rebuild is a good start. If the coil got hot enough to fail, I would replace the points just to be safe. Set the mixture jet for the highest manifold vacuum at idle or, to the highest RPM at idle.