Matt--
I'm betting that they went with high-impedence injectors and eliminated the resistor pack for the 3.5, but I don't have concrete evidence. The flow rates should be the same provided the 3.5 is still sequentially fired like the 3.2, so using the 3.2 injectors would be your best bet.
Keep in mind, too, that you'll be playing with fuel maps a bit with this thing! You'll probably have to richen up the WOT portion of the map due to your manifold change. I tell ya, that manifold design just looks awesome compared to the Type I or 3.5.
Keep up the good work!
Mike