Heres a 72 Chevelle for 5,900.
http://cgi.ebay.com/ebaymotors/ws/eB...561674165&rd=1

Here is a true 66 Chevelle SS for 6,600. Just so you can compare. It's somewhat in the range your looking in.
http://cgi.ebay.com/ebaymotors/ws/eB...560626447&rd=1

The only thing is for the money you spend what ever you get will probably have to be plain jane and need some work. I bought mine for $1,700 12yrs ago. It was just sitting on the side of the road for sale. It's as plain as you get just had factory a/c. I put the buckets in and did everything else myself. It was appraised about 6yrs ago for $12,500. It's due for paint and body work again though. You can just about bet no matter what you get it will appreciate. Keep your receipts too for everything you do to it. That will help when you get an appraisal and insurance!

I can look for other stuff later but as far as Chevelles go most of the "Buy it Nows" were just over $5,000. Anywhere from 6,000-8,000. Not that you want a Chevelle but thats just where I started .