For what your trying to do adding finger ports would benefit you more then widening transfers. I would think more area in the transfers would make it lazy in the low rpm your trying to make it run.
I ported my brothers 3.3 and all I did was clean up the intakes attempting to maintain the stock angles but squared off boost and fingers at the roof. Exhaust is stock on the outside and ~.070 higher in the center. It is no where near tuned yet and it turns a 15x34 ET 72-7300 with only 16* 4 stroking the whole time.