Give the guy a minute to digest having to give up his dream/business, and I bet he will. I know I would be crushed, and it sounds like he has other things going on, so try not to be too quick to judge. He always seemed to me to be a stand up guy. No offense, just saying...
I'm not judging, but if I JUST sold a engine to a guy, I'd be willing to give him the answers he needed to get it into his car.....takes like 5 minutes. No offense, just sayin.