67 GTS Value

Exhaust manifolds are unique to each year of 383 A-body. Those are expensive to find.
I restored a '67 383 Formula S FB Cuda in the late 1980's when parts were available and relatively low cost. This was a true basket case car. Photo on left. Jim Lusk knows this one well.
The engine was in the trunk and the trans in the back seat. Otherwise, complete. I put $6,500 into it including body work I did myself and with help, painted it '69 B7 dark blue (was copper) and it ran incredibly well. Front K-H disk brakes hekped (stock). 383 was bored and notches in bore for valve unshrouding (supposed to be Stock Class racing trick). Ran Isky 284/484 cam with TQ intake and carb from '78 400 Cordoba. This replaced the tiny AFB that was stock. This combo idled at 400, pulled to 6000, and got 15-16 MPG with 2.94 gears. 3.91 were stock but not drivable with 14" wheels/tires.
Sold the car due to CCR's at new house for $6500 in 1994. Wish I had a better brain back then.
So my recommendation is that you buy it, build it, and enjoy it. But expect paint and body work to make it perfect will now cost $40K or more even with no rust. Labor rates and the exorbitant cost of paint (Black is the cheapest) make full restorations difficult to finance.