Are you going to run the drive by wire that came with the engine? Do you have the tac module and pedal?
If you do, I would run a drive by wire, but you should use the stock green/blue pcm with it since this must be matched with the truck TAC Moduel and Pedal. If you dont have the tac and pedal, i would run drive by cable since it would be cheaper.
I believe 03 they started truck/van DBW.