This is your winner! If you want to scratch build an accurate 1/25 th scale mystery machine measure the shaggy figure, 3 inches is 6 feet in 1/24 th, and go from there. I have no idea on the engine, as the mystery machine is cab forward, has a bench seat in front (no engine cover like early US vans is posible) and a flat rear floor. (no rear engine like a Corvair or VW) You figure that one out.