Considering the 400 and the 4 speed the best way to realize the most out of the car would be to do a cosmetic clone i.e. primarily the hood, hockey sticks, and badging.

400/4 speeds fetch the most money. The only person that needs to know it's a clone is the guy who buys it from you.

If the car could be driven 1000 miles immediately after purchase, it's worth a 10K+.

Please post pictures, who knows, maybe I'm interested?

What rear end gears does it have?

Joe sez: "Not everyone is out for a #'s matching FGF. Done right, the car can bring more than a #'s matching car." Watch Barrett-Jackson and see that he's right! Cars with character and the right color/options are selling for more money regardless of #s. Needless to say the cars the bring the most are #s matching AND have character/provenance.