I've got a freshly rebuilt 1960 235 with duel Rochester small base Bs from 216s. It has a very bad tip in stumble, so bad it kills the engine on take off unless I give it about five quick pumps, and again after every shift. I don't know what jets they have but it runs great once its rolling. Reading threads here sounds like it"ss too much carb. Not sure I want to start drilling additional holes in accelerator pump which seems to be the solution most used. Has anyone had good luck with this combo with out customizing carb?