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I'd pull the heads and inspect them and the bores before deciding to by rings etc. Where squirting oil in the cylinders makes no changes to compression, it's likely the rings are good.
Camshaft bearings in a pushrod engine can last a long time, when the engine is taken care of. If you can drop the pan with the engine in, it would be a good thing to inspect the crank and rod bearings. Any journal grooving you can catch a fingernail in, out with the engine so the crank can be ground or replaced.
If the wear is minimal a crank can be polished, as long as that would keep it over minimum diameter for stock. If not, grind it 10-thou. 'Course with labor costs these days it may be cheaper to buy a new crank.
The last engine dad and I did, it was way cheaper to buy a new cast steel Eagle crank for the 91 Chevy 350 than to have the original ground. Also upgraded from dish to flat top pistons and King racing bearings. King bearings have a much thicker Babbitt layer than other brands.
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