Have you investaged what goes into changing the pump on an RT?? And are you sure that the NAPA piece will be a direct replacement? (I doubt it is)
Swithing out the pump is not as easy as it may sound.
I digress, you could conceivably use just about any pump to get fuel to the rails - so yes, I would assume a NAPA pump would work. However, like I said, it is just probably not plug and play.
Also, if you are looking for a cheap solution, just get a Walbro. They are 100 bucks.
If you need more info, let me know, I have had several internal pumps, as well as external on my Venom.
Regards,