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303 aerospace protectant
It takes lots and lots of fuel to screw up rings if it was dumping it.
If your running a vacuum advance can then too much advance at idle will make her smoke like hell and rev up and down.
I would always call GM Parts before looking elsewhere. They do still have parts for 1st Gen so I'm sure many 2nd Gen parts are still available.
Maybe someone welded it to the head.
Going to be 2 yrs soon. Probably priced too high IMO.
I still don't ever use gaskets on mine and the manifolds have been off several times.