well you have to look for frame rot, every single 240 will have rust on the front frame just behind the wheels, that is the worst spot, thats about the only major issue, as well as other body rust, but its more visable.
great cars, runs great, but they are starting to get expensive(they are becoming the next honda civic for all the kids out there sad really
)
but anyways, it could have been my 240 cause i had one for sale, and i was keeping one, but probably not lol,
and the 4 wheel steering works great for normal city driving, the reason they have an elimination kit is becasue for the track the 4 wheel steer does not react quick enough for serious racers, therefore they take it out
so i wouldnt worry about it, and most of the cars dont have it(but mine does
)