Heres a beautiful 72 for 23k, looks freshly restored https://houston.craigslist.org/ctd/5177372363.html Another 72, a bit cheaper for 16k https://houston.craigslist.org/cto/5140662352.html Clean 81, 12.5k https://houston.craigslist.org/cto/5201592480.html Restored 80, 17k https://houston.craigslist.org/cto/5156030992.html There are definitely some options out there. The later body styles are going to be much much cheaper.
those things are all fiberglass. No chrome or hard to find exterior parts. Can all be simply repaired. Get it painted and drop in an LS6.
Where do you guys learn about what price trends are for classic cars? Or do you just look at auctions/sales all over the Internet? I'm asking because I know people always say, it's like paintings sometimes... you get whatever someone's willing to pay for it, so a car that goes for $40,000 to one person one week may sell for $70,000 to another person the next week. Are there sites that keep track of sales from different venues?