Can you help me identify a Mustang

Yeah.
Person that owns it now had it sold to him under the impression that the motor was built by competition transmission(or some local shop with transmission in the name)
Had been built within the last 2000 miles or so for the blower.
He called them and they verified they built the motor by the shop before he bought it.
Ran great when he bought it, then it sat for a time, he started it and it runs like shit.
But the current owner doesn’t know all that much about cars. So who knows how much of that crap he was feed is true.
Says it came from tonawanda
I don’t know shit about mustangs…

What’s it worth?