Early 60's to Mid 70's Racing Classes ( "stock" body )

The first thing that popped in my memory was the "Gas" classes, better known currently as "Gassers". Although the classic "gasser" was an earlier-bodied car with tube axle front ends, the later years saw new body styles for better aerodynamics.
Take a look at the following link for a good explanation on class rules:

http://gassermadness.com/Gas_Classes/index.htm

Post up some pics of your build as you progress with it!