Typically what might I expect to pay for a done car?
Just shooting from the hip, I'd say $75k for that car if it's numbers matching and a genuine shaker and four speed. And of course in really nice condition. You could save some money if you settle for non numbers matching, no shaker, automatic, 70 rather than 71, or driver condition versus nicer, etc. I could be off on my number but anyone who tries to tell you this car can be had for $40k is living in a fantasyland.
I admire your taste in cars by the way...I want the same car outfitted the way you do. Gonna have to wait a few more years until I retire and move out of mega expensive California.
If you were serious about it and ready to plunk down a big chunk of cash like that, I'd start scouring the Internet and eBay. I see cars like that all the time. Not because there are so many of them but because they don't sell quickly at those prices. I see the same cars sometimes month after month. Not saying I'd buy of eBay or other sites but sellers of cars like that expect you to fly in and check it out. Then you can haggle in person. I see cars like this from time to time on "smokey mountain traders". They have tons of amazing cars. I'd love to just go there and browse.