vintage cars especially ones of that era are more along the lines of collecter type items, to some it may be worth alot, to others they really arent worth much.
imo it is really cool to have a complete older RC car like that, they definitely dont build them like that anymore, kind of a piece of RC history.
could quote Indiana Jones here "That belongs in a museum!" .

you could try selling it if you really wanted too, you would either not get much at all, or would get a pretty penny for it. would also be really cool to have on a shelf as a show piece as well. on ebay i see a new landjump for sale for around $2800 with box and all, then one right beneath that for 400$ used.

personally i would hang on to it, but if you arent really in to RC's anymore, it would just be an expensive antique paperweight to you, whereas you might get money for something else and someone else can show it off.