When you are doing your online searching be sure to check out the sites of enthusiasts. I hang out at
www.chevelles.com . It is great and there is a lot of general mucsle car info.
Here is a link to a page about how to buy an older car. You may know all this info but it is a good refresher.
http://www.chevelles.com/shop/buying.html
The classified ads on these sites hold a lot of cars. It can give you a better idea of what is out there.