picked up a 340 long block w/out specs
If I were to buy a car would I disassemble the engine just to see what's inside?
Hell no....
Sometimes we get so anal about this stuff...we really do.
In the oval track world few, if any, guys buy a motor and pull it apart. We buy the stuff to race... Most give it a once over, check the valves, might swap a carburetor and put the thing on the track.
GM crate engines are like that (you mostly know what your buying) but is true with "open" motors, too. Might give a guy some smiles if he knowsw the engine builder was but means very little in the grand scheme. Either it runs or it doesn't.
I got over all that hand wringing over small details long ago.
Just trying to make your lives a bit easier...