Unfortunately I hate to say it.......
..........but that mechanic is on crack.
Ain't gonna happen. Seems more and more mechanics are becoming druggies. My cousins have a nice little shop that my dad, grandfather, and uncles opened 20+ years ago. A few months ago my uncle died and in his estate was the Corvette my dad bought new back in 1969. My father and I offered up a few grand for the car and heard nothing. Then we heard a rumor it sold for $1600. Last weekend we saw a friend at a show and he told us about the deal he just got, a 1969 Corvette for $200! My dad's old car. Seems like they needed drug money.

(the rumor I've heard)
The price won't take a dive like $5k.