i guess the better results seen on the 2.3 and supercharger conversions are due to the the additonal volume of air required for the increased displacement. This is probably where the standard inlet becomes a bit marginal..

I think the cosworth inlet could work well with some gasflowing and this will inherently lead to changes in the volumetric efficency of the head. i,e it will need more air to support the flow.

hmm. need to do some thinking.. or maybe consider throttle bodies, but that just opens up a whole new can of worms..