2 Barrel Manifold

Does anyone know anything about Hemi Performance in Australia?

They have a sexy catalog and a bad reputation.

They have a two barrel intake manifold.

You certainly don't need to be paying currency exchange and overseas shipping to get hold of a 2bbl Slant-6 intake manifold! They're not as easy to get as they used to be, but they're still available in America with a bit of looking.

Or, should I get a super six manifold, or an Offy 4 barrel manifold with a 2 barrel adapter?

Either of those would be a fine option.