Yea swinters, you can never have enough storage space for spare parts, LOL. I pay $70.00 bucks a month for a storage unit for my stuff. The sad back story on this engine is the owner completely restored his 82 civi pickup and was heavilly rear ended by a tri axle dump on a exit ramp that was backed up getting off the interstate. he was Heart broken, and junked the truck. I was in the market fo a spare engine for my M1031 and checked out my lifelong friends junkyard. He said he had a 6.2 that has been "sitting up in back" for a few years. He had no idea about the red block thing, and thought it was just a 6.2, well when I saw the condition it was in I had to jump on it C code or not.
As per members of other websites that strictly deal with GM diesels, these red blocks are highly sought after by staunch 6.2 owners becuase they take to modifying better. Who knows? I may slap J code heads and intake on it, or just leave well enough alone and not mess with it. LOL!