The oil pan and possibly the gasket, the pump and timing cover, realigning the timing cover and sealing it again.
No thanks.
Not without every possible attempt at getting the bolt out in one piece first.
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.
Reinstalled many timing covers in my career, after doing a timing chain, and gear job, in my profession as an auto mechanic, without any problems at all.