Rust is a major issue. pull up the carpets and look at the INSIDE of the flooring, dont trust how it looks outside, check inside the wheelwells, pretty much the whole vehicle.
be prepared to fix oil leaks, change rubber lines all over, if need be, replace the master cylinder, see how the clutch cable works. if its tough to push in, or feels rough/jerky, replace cable, if you can, drive it around and if it doesnt feel right, just walk away.