I'm going to be replacing the exhaust manifolds on an engine swap using an 88 Camaro 5.0L TBI.

I've narrowed my criteria to the following:
- must be center dump
- must have air ports
- must NOT be a header

I know the "center dump" or "rams horn" style manifold is available. But I've not been able to track down a specific application for ones that have the air ports and one place I know sells them for about $260(might be $360)

The other "option" I've seen is a Sanderson QP1000. It is part of their cast quiet series... but I'm chocking on the price and I'm not sure on the smog legal status :(

Anyone have a recommendation? Or at the least a make/model to find a center dump with air ports?

And yes, I've done a search here and not found anything :p