I know its not the question that you orginally asked, but, have you considered other options?
I have heard that some or all of the gm crate motors are assembled in Mexico, or some place other than the US (not positive).
I would look into having a machine shop or engine builder do the job. They will set the engine up the way you want it (torque, hp, etc.)
Just a thought.
Sallee Chevrolet out of Milton-Freewater Oregon(NE corner) sells them, they are very reaasonably priced, and have a really nice website also. this is where I got my crate motor. They were at least $500 less than any of the other Gm or Chevy dealers in the areea.
No affiliation, just a satisfied customer.