Well, let's see . . . there is:
Fenton
Edelbrock
Edmunds
Harper
McGurk
Newhouse
Nicson
Sharp
Offenhauser
Thickstun
Tatersfield
Clark
Wayne
Lee and
53-54 Corvette Factory Intake.
Some are 216 intakes, but the ports can be opened up to fit the 235-261 head. With a 216 intake you will have to run small base carbs, but some believe the smaller base cuts down on the CFM of intake, thus the vacuum rises and the fuel and air hit the combustion chamber quicker.
Good luck on your hunt for an intake!
Joe
