Idk I have been at Sac Speedway and watched a 70's bug with about $5k into it (worth about $3k) tick of consistent 12.1's in the 1320. That's damn respectable, and even hard to come by for the cars you rattled off, and for much lower price tag. Plus if it gets hurt, you can buy a new one for nothing, they made them new into the 2000's in Latin America still.
I worked at a Hot Rod shop for 6 months and do all my own paint, body, and fabrication. While all those 60's era cars are nice to drive on Sunday, they lack in creature comforts, and the biggest thing; are hard to repair when hit by a moron, because factory parts are becoming unobtanium.
I guess my engineering brain takes over and while cool, both lots are old engineering, wrapped in an old package and not something I'd DD. We've come a long way in 50 years.