Slant six single, to slant six double.
if it's the long runner aussiespeed hurricane manifold, I'm interested to find out how it works....I *think* all the aussiespeed 2bbl manifolds are a holley 2300 bolt pattern. my duster is all stock, 1bbl slant6, A833OD with 3.23's, and it keeps up with modern traffic just fine, but would like a little more pep while keeping the 6. if you want to go the decked block/head/cam route, you may want to just find another engine and do those mods to that, so then it's a couple day swap to minimize downtime with the car, vs. having the engine tore apart for a month+ where you can't drive it....