With an exhaust more open than the stock muffler, the jetting needs to be opened up. I suggest using the set up for the 022A to start with, as no one knows how different the pipe pressure you have now differs from the stock pipe. Slide needle 4th notch from top and #100 mains. Expect much poorer fuel mileage than with the stock exhaust.
Probably, you don't need to rejet the pilots at all, but you will have to find a new pilot mixture screw setting that allows proper off idle throttle response (richer, or turn the screw inward in small increments, until you can twist one half of remaining throttle travel in any gear from idle and have the engine pick up reliably (if slowly).
It has to run rich at idle, as there is no accelerator pump action to compensate the lost fuel flow when the slides are raised. (No CV carbs or fuel injection computer on this model.)
New gaskets does not clean the emulsion tubes. And, if the air bleeds are plugged, it will run rich as well as poorly. The Main jets also need a good sealing oring. Viton is best if you have ethanol in your gas.
