Well, there are not that many LS6 Chevelle SS with matching numbers out there.
Yessir.
There was a mid 60s Model SS Camaro with all matching numbers and a has a big block 396 ci, 375 hp that went for 105,000$.
Had 30k miles on it.
Inflation from '66/'67 to '21 approximately 700%. If one had the means and patients they could return 4X on original investment. If inclined to pay capital gains, subtract 28 percent.
Personally, I would be inclined to drive the $hit out of it and have $200k worth of fun!!
...then sell it for a restoration candidate for equal to what I paid for it (accounting for inflation).