I am still running a stock fuel pump, but have a rewire kit in. at one point I had a 2.9 pully with full size intercooler, ported heads, XP cam and a few other things, so I would say to start with a rewire, and go from there. when the need arises, I plan on grabbing a walbro 255 from wbodystore, it's like 100 bucks and comes with everything you need. I am considering going to E85 as well, and when I do, the stock fuel pump probably wont flow enough.