I think the VIN showing it was a V code is worth the effort to restore if you have the means to do it. A matching numbers car will ALWAYS be worth more but a true V code SFGT with a period correct non-matching drive train will surely still be a valuable car.
This car restored would be worth more than a lot of matching numbers cars. It's a V code and original production was minuscule.
A
LOT of V code and Hemi cars have non numbers matching blocks. A lot of RR, GTX, Super Bee, R/T's and other HP 383 and 440 cars are missing their original blocks and some also missing the numbers matching tranny. High Performance cars were driven hard and wrecked and even if not totaled and gave up their drive train many the drive train was blown up and replaced. Numbers matching was never really considered by the masses at the time so many surviving cars that were parked and later resurrected are not numbers matching. This would apply to the Sport Fury GT V code cars too.
Numbers matching is also not that huge a deal for price of a muscle car unless it's a pretty special OE GOLD certified car or something. The quality of the resto, what the car is, what options, colors, convert vs hardtop, manual vs auto, etc have a bigger impact on price than numbers matching drive train. Numbers matching will affect your buyer pool more than the price for those that care about that more than other things.
The killer to a muscle car's value to many is a missing fender tag. Unfortunately the single biggest killer to this car is the missing fender tag, even more so than present condition to many people who would otherwise be interested I suspect..
A bonus but somewhat uncommon thing is build sheet. The SF GT in this ad has two build sheets. The build sheets somewhat make up for it to SOME people who may actually be interested because the build sheet actually has a lot more info than the fender tag, and you can get a reproduction fender tag ... still not as good as original though but to some OK with a build sheet to back it up.