Where do they rust?

Here you go!
http://www.panteraplace.com/page57.htm

Thanks a bunch. Wow! This guy spent some time putting this information together.

Yes, Mike Dailey's site is full of great info.

Don't forget the "Hammer Test" on the frame rails. My `73 L rear frame rails looked good showing no signs of rust, the factory undercoating did it's job, however when I tapped it with the hammer it caved in. I have since made a template and had a sheet metal man make me some new ones out of 18 gauge galv. for less then $20 each.

The known 'soft spots' for rust are the quarter panel behind the driver's seat, both rocker panels. On some cars, the invisible backside of the unpainted gas tank, the rear suspension attach points for the a-arms (big horseshoe-shaped weldments) and the chin area below/under the radiator. The windshield lower area under the gasket tends to collect moisture & rust, sometimes perforating the body behind the dash. A 'Bondo-meter' or paint-thicness gauge is invaluable when shopping any 20-30 yr old car!

Thanks for all of the information. I appreciate your replies!