You would think that the early A guys would want more exhaust options.
A shorty header that clears PS and would have factory ground clearance with a 2 1/2 inch head pipe. I know TTI makes them, and I'm sure there high quality. But a little on the pricey side.
I use 340 manifolds on my 340 with Magnum heads. I had to make adapters to go from the small port exhaust on the head to the tall port on the manifold. I would have bought a shorty header then if I would have had that option.