Header help !!

I'm putting a 440 in my 72 Duster, does anybody know what the best headers are for this. Also any idea on engine mounts and can I still use my OG 340 K-member? My car is going the route of nostalgic Super Stock, so I'm not afraid of fender well headers either, and I am looking for long tubes.
And yes, the car is a true 340 4speed H code car, but unfortunately the OG engine and trans were long gone when I got the car, so I'm doing what I want...time for a drag car!