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Never, ever start a car and let it "warm up". The engine never gets warm enough to burn off condensation. It also runs on the choke which adds to the over rich problem and washes down the cylinders, which puts more fuel in the crankcase that doesn't burn off. If you are going start it, drive...

What do ya expect from the company that makes FRAM filters?

Looks like it has been on the choke a lot and not driven much. That said ensure the choke is fully open when engine is warm. I haven't used Champions for ages but the last time I did they didn't work well. Give er the old Italian tune up and flog that thing.

Nothing wrong with Autolite plugs. Sitting so long the carb is probably dirty. Octane low? Does it spark knock on accelleration? If not, octane is fine.

Are you running a stock cam? With the low vacuum I would say not. Maybe the cam is closing the valves early, raising compression. That won't tune out. Just thinking out loud.

Avgas is not formulated for high revving engines. Its made for slow turning, big bore, constant spèed engines. Additive packages are different.