I would ask, what class/engine size are you planing on running.
In my CGALT and BCGALT class a Monza body seems to have an aero advantage. Would love to build one but I have a 1970 Camaro so I will try and make that barn door fast.
I would add, build what you enjoy, because you are going to spend a heck of a lot more time building it than you ever will driving it. Just saying.
BR