Frozen lower left alternator bolt

It's no big deal in reinstalling a timing cover back onto a small block engine.
What's the big deal?
That's what they make RTV silicone gasket sealer for.

Too many people can’t even get the bolts back in without the oil pan down, let alone align the balancer hub in the seal.
Sure you and I can, but…
Just saying I would try everything else first.