I had more fun with my old Scalextric pin guide vintage growers than any other car I ever had. And used to do competitive stuff in the 60s. I bought the pair again at the Gaydon Slotfest a couple of years ago and have been collecting suitable RX type motors to put back in these later issue bodies, so that I can still have a couple of old growlers.
That looks like a very nice kit for its age.
I also had a Gowland and Gowland plastic kit as a nipper in the 50s. First kit I ever had. It was the Model T. It had metal axles and steering column and the weirdest "Hicksville" driver ever!
Cheers,
Martin