IF and that is a big if you can get the persnickety judges to call it 100% proper after the rebuild that would be great but from my experience with my 67 Vette it will never get that judgment again. Sorry. It sucks, but that's the way they are.
I don't know that I would worry about getting to be stock again.
Those who have read my various posts will know the 67 Vette could never be judged as stock/perfect if nothing else because when I got it the hood and nose had been cut off at a 45° angle by a freeway chain link fence. All superficial body work but by bonding on a new nose/hood it lost stock value then and there. Not to mention converting from full length stock exhaust to stock 67 side pipes (quite the expensive chore btw) but didn't match the VIN numbers at that point so there goes some value even though it improved the car. They want bone stock. The Gulstrand suspension and Compomotive wheels and P7 tires even lowered the value while for me it made it a much more perfect vehicle.
Same with the 'Bird.
I believe I mentioned I was in the middle of installing a 5 speed and lowering springs when it was stolen .
To my way of thinking if it isn't bone stock to start with I don't worry much about what it will bring at Barrett Jackson.
Thus, and this is just me ruminating, since one can get the interior parts and fix things like door handles and locks etc and other cosmetic damage I would put a Art Morrison front clip under it and an Art Morrison IRS under the rear with coil overs all round. The stock engine is great no need for more than a freshening up, but it would then handle as well or better than a new Vette.
My 04 Mustang Cobra is lowered on Eibach springs and roll bars "they" wouldn't even like that even though it now handles 100% better than stock. I may throw coil overs under it if I can justify the cost.