1968 Barracuda Fastback 340 Formula S?

I've found a '68 Formula S w/ 340, 4 speed trans. Seriously thinking of grabbing this one. Everything is there, and all original, and it will run and drive. Have a few questions though. It has rust, bottom of doors, under the lip of the trunk lid (not on the edge), quarters (new ones included with the car), and I a bit on the front fenders (not too bad). Common rust areas for this car? Any places unique to this car that I should be checking? Frame rails are solid as are the floor pans and trunk pan. Wondering what would be a fair price to pay for something like this? I have no pics to post unfortunately. Any input would be helpful.