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I wouldn’t rush into taking things apart.
The engine has been setting for a long time. Valves are most likely sticking or slow. I would start with some Marvel Mystery Oil in the gas.
I once found a Model A that had been setting in a barn since the end of WWII. Engine was really noisy. New HD 20W-50 oil and MMO in gas made all the difference within a couple of hundred miles.
Enjoy.