So the right carb was leaking, big time. Order new float valve and adjusted float per the book.
Still leaking. Adjusted float some more. Got leak stopped. But...no gas getting to right cylinder.

Called my master carburetor mechanic who had a super idea. Why not take the bowl off the other
carburetor and measure how the float is hanging. Big difference. Adjusted right float to match left
float geometry, reassembled everything, and voila - no leak and both cylinders firing.

Thanks Tim!

Of course Harry will have a negative comment, but that's to be expected.