How difficult should it be to turn over by hand??

I got a set of main bearings from summit one time that were supposed to be 10 under, but they were actually 20 under and put in the wrong box. the crank got pretty tight but I discovered it as I was rotating the crank and tightening the mains down. I always plastigauge them just to be sure. same with rod bearings. cheap insurance. if the crank will turn by hand without the rods, and they are torqued down, I doubt that's the problem. if the pan isn't on yet, I would plastigauge everything anyway. use plenty of assembly lube