Tear into it, or bolt in and go???

I always take the safe route and it ends up costing stupid money. I pull the cam out and find a nick in the bearing so apart the whole engine goes and $.

“IF” you have the time- drop the pan and check how clean it is and replace the pan gasket. (Hardest gasket to replace in car.)

Now if you do that and run it and it runs good! Hurray. If it goes “BOOM!” Then you have the other engine as a back up.
Typically if I have an engine waiting on the wings, the first one lasts for ever.
Syleng1