If that hole is blocked the carb will run extra rich. It allows vacuum to go to the power valve piston. Without it it will be on full rich all the time. Sure, it may run good but it will waste gas & cause excess carbon & dilute the oil. If the holes don't line up, cut a passage in the gasket to allow the vacuum from the intake manifold to reach the hole in the carb.
Last edited by Wrenchbender Ret.; Wed Apr 29 2020 07:06 PM.