I have a 77 f150 with a 351m. Does anyone know where I can get the ducting and channel pipe that comes out of the air cleaner housing and mounts to the core support? The one im talking about I believe is called a fresh air inlet/preheater pipe. Mine use to have one but its long gone now and id like to replace it.

 

I don't believe anyone makes it aftermarket. Salvage yard is your best bet.