You could but...... Seeing that your engine is not stock. As cheap as they are you really need to upgrade that pump. I would imagine that you are maxing out those 19s with the combo you have. If it were me i would upgrade the pump its a cheap and simple install
you'll have to upgrade the MAF to use those inj. anyways so if its a budget concern, you might as well wait. you'll want to do the pump, inj, MAF at the same time if possible.