I want a Superformance GT40.

Steve - yes you can use a replica GT40 for CAMS OR AASA competition. YouTube and search 200MPHGT40. You'll then see a wide variety of events that I have done. What you do with a GT40, real or replica is basically limited only by your imagination, chequebook and of course driving ability.
So buy one already and get on with it!
Nice channel, subbed. Awesome DRB you have there.

Cheers for the info.