Johnathan,
I follow the sub $200K retail market in Asheville regularly, but not Black Mountain, so I might be off a little... I think you're right to doubt his ARV. $171k for an 1100 sqft 3/1 does seem high for that area. I've seen several rehabbed small 3/1s in the 125k-150k range in Asheville this summer.
Also, when he says it needs 30-40K to get it up to code, I assume that means just to get it to code? If so, the rehab could easily exceed your 50K number too.
Conservatively since this is your first, I think you should consider seeing it in person and verifying the numbers by getting an agent to run a independent CMA (Comparative Market Analysis) and have a GC (General Contractor) walk it with you to give you an estimate. Even if those both cost you a little, what you learn may be worth it for this deal and others and could save you some trouble. Plus, you'll be able to provide that additional info to your buyers list which will help them feel comfortable that you've done your homework and allows them to make a better informed decision.
Another alternative would be to take it to another experienced wholesaler and see if they'd be interested in helping you through certain parts of the deal for a portion of the potential profit.
Pat