I had and have still got the car chassis kit from the early 80's

Loved that back when I was ten. Even then it had working suspenion, a flat 4 engine with working pistons, a 2 speed gearbox (although I remember modding it to a three speed), rack and pinion steering and adjustable seats!

This one (linky below)....
http://www.brickset.com/detail/?Set=8860-1