You could run the MS3PRO for less than the cost of a race pack and then use a cheap tablet as your dash. Then when you are ready for EFI you already have a good chunk of the work done and you already have the controller.
Have you tried this? It sounds like a great way to go, and maybe could be an easy way to switch back and forth between carb and injection to get real world results and see which works better and if there is any more power to be had.
