How rare is this and what's it worth?

ive done the same thing with people been friendly and have gotten great deals .I just recently bought a snow blower off craigslist guy wanted $40 said it ran but auger wouldnt disengage no big deal . I get there seen he had a old 72 ltd convertable in his garage started talking to him about it gave him a few ideas for the engine and walked away with 3 snowblowers all running and worked well lol. he kept my number and just talked to him last week he needed help with his car , I helped him out and got $200 plus some parts for my galaxie from him . so you never know