Soaking in PB now.
One of the plugs I pulled had rust on the inside of the plugs. That's a new one. Shockingly the carbs are free as well as the throttle cable.
Tank is toast. Upper fork tubes toast but the rest looks like it's come back with alotta elbow grease, wire wheels etc. Looks like somebody broke a sparkplug off even on number four. That'd be fun.