/6 Header for Duster?

So, right now your drive train is build for that slanty, you have a 904 tranny, and a 7 1/4 rear axle. If you do your upgrade, you need a v8 k member, or you need to get special motor mounts for that /6 k member. If you upgrade to the 360, you'll need to replace your 904 and 7 1/4 to a 727 tranny with at least an 8 1/4, more than likely you'll want a 8 3/4 rear.
I've spoke with many guys at spring fling and other car shows that spent some coin at clifford performance and love their /6 mods.
a slant with headers sounds pretty good, and with a good cam upgrade makes some decent power, but not enough to chew up your drive train right away.

Hope that helps.
Stu