The other option is to try and free the engine. I warn that there is the
risk of breaking piston rings and/or the lands on the piston. Remember you
have a rather rare 5 bolt block (I think). There are many method that can
be found on the internet. But typically something like "Marvel Mystery Oil"
is put in the cylinder. I would recommend about a cap full or two. Then
with an air hose in the spark plug hole (and a rag to prevent platter) give
it a blast to spread it around the cylinder walls. This will help to ensure
it works its way around the hole piston. The MMO is allowed to sit for a
period of time - maybe 24 hours. Then try the rotation again.
If it gets you anywhere repeat the process until everything rotates
decently. Once there is some movement I would alternate (back and forth) the
direction of rotation to hopefully "pump" the MMO between the rings. Having
said all that, why was the car parked 35 years ago? If it had a spun bearing
there is no advantage to attempting to free it up.
Tom
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