Cool idea for vintage cars that were unremarkable when it came to driving characteristics or where only the frame and/or body survived with no drivetrain and hard to source donors.
Where is your sense of adventure? If you do it to a DeLorean, you might wind up with infinite time. Plus, pretty much every local car show I've been to has a handful of DeLoreans that I'd assume the owners are probably over maintaining. Actually, scratch that, let's go into a 3D printing business for DeLorean replacement parts to get the money thing down.
Many DeLorean parts - famously excluding the left fender - are still available as NOS from the company that bought John DeLorean's factory.
In fact, there are still complete, servicable engines _and chassis_ available. And the chassis are already registered with a VIN, so when built can be sold as a new 1984 model year vehicle.
If I remember correctly, it was the next part to be manufactured en mass before the factory shut down. They'd do a few days of X part, another few days of Y part, etc, in rotation. Another part of the factory was assembling the complete vehicles from the parts in stock.
Yeah, I thought of the first corvettes that had catalytic converters:
1974 models had the last true dual exhaust system that was dropped on the 1975 models with the introduction of catalytic converters requiring the use of no-lead fuel. Engine power decreased with the base ZQ3 engine producing 165 hp (123 kW; 167 PS), the optional L82's output 205 hp (153 kW; 208 PS), while the 454 big-block engine was discontinued.