i would imagine using a set of split port heads and windstar/freestar 3.8/4.2 or f-150 4.2 intake would help a lot, when coupled with a supercoupe bottom end for durability.
BUT if you cant use the split port heads use a set of NA intake manifolds and that should make your job a little easier-- i think.
But, this is all theoretical. I am probably not 100% correct on my info.
Ghost