Maybe a couple reasons why more original aluminum maxwedge cars don’t race in Super Stock.

NHRA mandates that you must use aluminum body panels to race as an aluminum car. No glass allowed
The other reason is obvious - their value in original condition. No one wants to cut up an original aluminum car.
Another brain fart from NHRA, you can run aluminum heads, aftermarket bucket seats, a Ford axle but you can’t run fiberglass in place of aluminum.