This is a 35+ yo car, and it sounds like the present owner has done a lot to it.
The guy also sounds like he knows what he's talking about.
There are plenty of beater 'Vettes from this era out there.
It will always be cheaper to buy a car that's been well sorted than to buy a beater and fix everything yourself, and this one appears to have been well sorted.
As a matching numbers car with no body mods, this car is pretty original.
I also like the probably honest mileage, as opposed to the current owner having it set back.
It is amazing (suspicious?) how many old low miles Corvettes are out there.
I'm not saying that you should buy this one, but if you like this particular body style, which remained very similar from '68 through '77, I'd say that this car is certainly worth a look.
Obviously, price will play a role.
This car would be a steal at 10K, assuming that everything checks out.