Cut the filter open by slitting down one side, keeping the shell and top in original condition. Then slide it over your aftermarket filter when you're showing the car, keeping the cut slot hidden under the filter, and go for originality points. Otherwise, keep it for the next generation owner.
Car show guys do this with the original Delco battery, gutting the insides, and slipping it over the aftermarket battery - sort of a "dummy" showpiece. Unless you looked closely, you wouldn't notice it.
I once saw a show car street rod that had a 6-71 blower mounted to the top of the engine, but it was only for looks. The drive belt was functional, but inside, under the blower shell was a standard Holly 4 barrel carb, completely hidden by the blower. Looked cool, but you could tell by the sound that the blower was not blowing.