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If you had a leaking leaf valve plate gasket(s), that could easily cause a lean running condition. If you have the whole motor apart you can always put a drill on the flywheel nut with a socket and turn the motor over using the drill gun. Turn it over CLOCKWISE, continuously, and you can watch the ignition system working real time, and if the carb is off, you can watch to see if the leaf valves are fluttering (it will be very obviously).
If you don’t see them fluttering fairly evenly, that provides more detective work/clue toward the root of the issue. Once you’ve ruled out ignition and manifold, that only leaves 1 more thing, assuming the exhaust side it OK.
Those 3hp motor are very simple, except it takes a few extra steps to strap the fuel system back on in between repairs when you’re going through test trials. Good compression numbers, too!