Welcome to the board, John!
A compression test will tell you if the valves are all closing properly. When these engines have been run a lot without a valve adjustment, the valve lash will go to zero and it'll be hard to start and run poorly while warming up.
Cleaning these carbs is not trivial. Here is a page that might be helpful:
https://n4mwd.blogspot.com/2013/10/s...-passages.html
Have you verified petcock flow? It's vacuum operated, so if you suck on the vacuum port, it should easily open and flow well.