Soooo....
I was thinking about it, and as long as the block has an oil pan, timing cover, oil pressure sending unit, cam and lifters, there shouldnt be a mess. All the heads do, as far as oil systems go, is return the oil to the bottom, after it is fed by the lifters/pushrods. So, coating everything with engine oil, and the cylinders with a light oil, should get oil into all the bearings.
Either way, a complete inspection of the bottom end will happen, as well as a torque check.
As far as the counter clockwise thing goes, I would expect it has more the do with a fully assembled engine, not a shortblock. When assembled, the oil pump would run backwards and not feed the engine the oil it needs for bearings and such, maybe even creating a vacuum that will pull air into some of the passages, possibly causing cavitation on some level. A shortblock, however, wont spin the oil pump since there is no distributor.