NEED HELP SLANT 6 T0 318 DUSTER EXHAUST MANIFOLD

Here is a company that makes what you are looking for. I have used them a couple times. I'd recommend the 67 Barracuda 273, 4 barrel exhaust with the manifolds you have. Single with 2 1/4 pipe. They have most anything OEM in steel or stainless steel. Bolt up and go. I have a 273, 2 barrel Y pipe I am pulling out of the 67 you can have for shipping if you want.

1965-67 Plymouth Barracuda V8 273ci 4 BBL Carburetor Single Exhaust w/Resonator Eliminator Pipe