Here's some of the measurement differences between car models. This is for 75, so I assume pre-absorber cars will be shorter overall. This is from the Plymouth sales brochure.
Length 195.4 inches
Wheel base 111 inches
Track front 57.4
Track rear 55.6
The interesting thing is that since I had to add spacers to the front wheels when I put the disc brake kit on (in order to keep the 14" wheels), my front track is now the same 59.1" as the '75 cars in your pic.