I'd say for a stock rebuild or restified engine, as long as your block, crank, rods, and heads didn't have any major problems you'd spend around 1500$ Add more if you pay someone to put it together.
It seems like people make these engines out to be black magic to put together, but I feel like anyone that pays attention to what they are doing, and uses common sense will be OK. At least on a basic rebuild. I'd just try to avoid running much over .002 clearance on the mains because it can bleed oil pressure to the rod bearings (especially with 1/2 groove mains), I feel on a rebuild it's pretty straight forward.