I do not know anything other than what I was just able to find out with a few phone calls.
As of today RELIABLE CHEVROLET, INC.
3655 S CAMPBELL
SPRINGFIELD, MO 65807-5294
Phone: (417) 887-5800
has a GM crate remanufactured engine in stock. Cost is 2225.15 plus a 600 dollar core charge.
Installation is a whole 'nother issue.
H & M Machine Service
2375 Verna Avenue, Maryland Heights, MO 63043
was refered by the GM dealker in Mansfield as a good shop that can rebuild it, or install it. You also have the option of going to a GM shop, there is a GM dealer in Mansfield right off I 44. I did call them and they did not have a motor, but could get one, they wanted 4300 for it.
Hope this helps, I just look at it this way. I have a motorhome I plan on keeping for a long time with a new engine in it. I get to enjoy the new engine and not have to spend the money just before selling it to make it saleable.
The last option is a boneyard, but I would be leery of saving the money on the engine and spending it on the labor again.