No off the shelf headers exist. I have ran N-heads before, the N352s on a 330" stroker. The exhaust flanges are a pain, not just the flanges, but even finding gaskets. It was an OK head, but after all was said and done, I wish I just did a set of aluminum instead. That head was build for circle track racing in classes that require a cast iron head. There are a bunch of other odd little parts that go with it. offset intake rocker arms and special guideplates (when I was done I had a few dislikes for the design and the side loading that occurs due to the offset and angle of the pushrod, thrust is not in line with direction of travel, bad for long term durability). And special correct length hardened pushrods. But the 10° valve angle has stupid amounts of clearance to the piston. They make special pistons just for those heads that are flat tops with NO valve reliefs. True flat tops.