360 Advice Needed...

Oil Pressure gauge reading? Even a temporary cheap aftermarket gauge under the hood.

Also can start it then pop a valve cover to make sure oil's getting to the top end & very that the valvetrain is ok. It's a little messy but a good check.

If it's got oil pressure & top end oiling then I'd run it for awhile to see if some of the lifters pump up. Just don't rev the crap out of it. I would think 2000-2500 rpm. I'm no expert though, just what I'd try.