Is this a stock block? If so, all you need is siemens deka 60lb injectors to make block splitting power on e85 (over 600 crank) using your existing pump (if its rated for e85). If you have an aftermarket block, you can make about 850 on Siemens deka 80's with a walbro 450 in-tank. If you want more, you're looking at big external pumps and big injectors (120's or 160') in order to make anywhere from 1000-1500+.
To be on the safe side, or if your current pump isn't rated for e85, I'd go with a set of 80s and the walbro 450 pump now. That way you have plenty of fuel and room to grow if you want an aftermarket block. The pump is only like 100-120 bucks and the 80's can be had for the same price as the 60's.
I use the 450 and 80's in my car on e85 and it's been fine.