I have a pan with a Super B and I love it, but the Super B is notorious for leaking around the throttle shafts from wear. This, or an intake manifold leak, will make any motor hard to start and tune. Did you install the new throttle shaft included in the rebuild kit? Sometimes that's enough. I see your kit also includes two steel bushings. Be aware that if these aren't installed extremely accurately you'll end up worse than before. It's a job for a Bridgeport. Also, you said you were giving it full-throttle primer kicks. The enrichener circuit on the Super B doesn't do anything at full throttle. It needs manifold vacuum to work. And 90 psi compression on both cylinders is definitely enough to get the motor started and running okay. Good luck.