Starting a long sitting engine.

Maybe just 'tap' them LOL.

Spray some Marvel Mystery Oil into each spring on the vavle stems to get into the guides.

Pull all plugs and put some MMO in each cylinder and let ti set a few days before attempting to turn. Turn slowly and without too much force. If it wants to stop. don't force it. If you do, you can break a ring. Work it back and forth and use more MMO in each cylinder.

Check to be sure there are no acorns and stuff in either the t exhaust ports or intake anywhere; that will be common in Keyser. If so, they can get into the cylinders through an open valve.

The fuel system absolutely needs to be pulled apart 100%; don't be lazy on this part.

Lots of other good stuff above!