Blue Brick

You said you are going to run an E body in road racing and the A body is for autocross?
I not that familiar with any of this although I think understand the basic differences.
My question is why not run the A body in road racing?
The A body should do everything the E body does and be lighter?
Did the Green Brick not run in road racing courses?
IIRC Petty continued to run a Road Runner in the sort road courses because aero was not that important in them.
I can only guess there are some restrictions in modification that can be done associated with rules about classes.