It could have a 390 and run but it is listed in the registry with a Shelby ally engine. It's easy to justify because it's original and it's the best. Not my words the words of the guys that run the fastest Thunderbolt in the world with, yes a Shelby engine. Gear
oil has good tackifiers in it these days I don't believe rear end or gearbox will be an issue. Snakehunter will figure out what it all needs when he has it in front of him. The rest is just conjecture at this point. The maths is pretty simple though, ally body 25K, chassis 10K, CSX# 10K, complete rear end 10K, front end 5K, wheels and tires 2K if there's anything saveable beyond that it's all a bonus. The gauges for example I would just send to Nisonger and have then go through them, it's still less than a new set.