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

Yeah, there are a lot of bad stuff out there. People wonder why almost no one touches my cars let alone the engines... If 2 are suspect, I would not have a good feeling about the rest. I usually just recondition my rods, but have a good machine shop, and my own dial bore gage and setting rings. The big end of the rods are the most important part of the engine. Good Idea, KrazyKuda, to rebalance if you swap rods.