Well the 2.3L duratec has pretty short runners. The duratec cosworth intake has a airhorn type setup.
Check this out.We have much longer runners than that. Makes for a torque-ier setup.
It's be interesting to compare an intake manifold gasket from each. The problem with putting a duratec manifold on is that the intake would be on the passenger side. You'd have to extend your throttle and cruise cables.
BP