I bought my first Mustang sight unseen, but inspected beforehand. I paid $12K US for a driver C code coupe, with a supposed 393 stroker, aftermarket heads, and built driveline. Inspector told me most things, but missed a few smaller details, but also missed out that it was a mild 351w and stock driveline. I'm not expecting him to pull plugs out and measure stroke, but you could tell if it were a 6.5 litre engine, and if the driveline was not stock. The aftermarket heads would have not had Ford casting details either.
I've bought other cars locally, with not much more than a look over and a quick drive. After all, most stuff isn't apparent to the naked eye.
I've got another Mustang in the process, and am confident that I will be getting what I expected.... a 40+ year old car, in good enough condition. You can't buy 40+ year old cars, like Falcons & Commodores at a used car lot. Newer cars are 1000 times better when they were new, let alone only a year or 2 old.