I was just on line chatting with Stacey in the customer service dept at Performance Years, she shows several parts to convert a 71 to Ram Air. I have her working up a list of parts and pricing to do a full conversion. I have a 71 LeMans GTO Judge clone (I call it my Le Judge
It has a NOS steel GTO hood and the non Ram Air double snorkle breather. Stacey says they offer the pan to go on the underside of the hood, the new breather and the kit to make it functional, the cables, brackets, etc to install the operating lever inside the car and the hood to breather boots or seals. I'll let you know what I hear back from them.