They certainly were purpose built race cars even then, the suspension is as close as I could work out after doing quite a bit of research, there wasn't as much info available on the web as I thought, there is an Alan Mann racing book which I have and this was a good resource mostly text but some photos. The biggest thing with race cars is that they can be changed quite a lot between races so being too much of a rivet counter isn't really worth the frustration, if it looks right it is right. I have a Mk2 escort in my garage but more of a road car than a race car.
Cheers Steve.