Optimum exhaust manifold?

Heyas.

Been collecting parts for a turbo setup for my Aus A body and have decided a set of magnum manifolds would be best.

These are quite rare in Australia (none sold down here).

Clearance on components shouldnt be an issue I imagine as they will need to be swapped left/right, ending up facing forward.

I have narrowed my choices down to the 92-93 dodge/jeep manifolds with the 2.125" exits. Would these manifolds flow about the same overall? Are the jeep units the same on the exits? I have read a few posts that indicate they are anywhere from 2.5-2.25", but I have no way to check for sure.

Thanks in advance.