How much of the idle transfer slots is exposed in the center carb at idle? If the throttle blades are open too far into or past the slots you will get an off-idle stumble.
I have a '66 tripower setup on my 463 with a big cam and run a 65 jet in the center and 74's on the ends. I might drop to a 64 in the center after some dyno tuning as it is slightly rich right now. I drilled out the idle tubes a few thousandths (stock is 0.032" and I went to 0.038") and also opened up the mixture openings to 0.073". Also had to adjust the accelerator pump linkage rods a little bit so that the pump starts squirting right away. Without adjusting the acc. pump linkages there was play that kept them from squirting which caused a stumble.
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