Outside of the machine work* anyone with a good book and a torque wrench can assemble an engine, and should!
Sure it's good to have experience and to have the extra tools to check and verify the machine work.. but if the work was done right you wouldn't have to do/check anything you could put a blindfold on and simply have somebody set the wrench and listen for Clicks.. and the motor would run fkn grrreat. . . well..almost..lol
I can do it cheaper where I'm at.
So I'm like..10k for an engine?? most of the time fkn car ain't worth ten grand 'by itself' lmao..