[jr_ss]

You're going to want a minimum of 1600cc injectors if you run E85. Twin Wally's or a Bosch 044 will get you all the flow requirements for 600-800. You'll need a -8AN feed that you can split into dual -6AN lines to feed both ends of the rail. Then have a -6 return out of the center. You'll need a custom rail for this obviously. I also recommend teflon SS lines over rubber SS lines. Are you looking for crank or whp?

Personally, I'd ditch the P12 head, save yourself some money and frustration and buy a P11 head to work over. CFM differences are minimal at best between the two and the P12 has weaker valves than the P11. Not to mention limited availability for aftermarket parts on the P12. Think about what it costs for P12 head alone and then the amount of money you're going to drop into it in Port work. A worked over P11 head can and will flow the same as a worked over P12, just much easier to acquire and much cheaper to purchase.