I dont know about tuning with just a MAFT with that size injectors. They will be like having 816cc injectors on gas at lower throttle settings. At high throttle you'll want to lean a lot more than that. When I had 680cc's and just an AFC, I had low throttle at 0% and high throttle at like -20% or something. To get it to work decent I had to set the high throttle point to only like 40% throttle. The stock fuel maps are like 9.3:1 or so, and you'll want to run between 11 and 12:1 (11.5:1 gas = 7.64:1 E85; 12:1 gas = 8:1 E85).
No you won't need a 2nd fuel pump no matter how much boost you run your 16G at. A walbro 255 HP and 750cc injectors are good for over 400whp on e85. Your larger injectors shouldn't make that worse, unless you run insanely rich. I actually ran the stock fuel pump for a while in my 1G at 20psi boost (14B) w/ 680's and it worked fine.
With the right tuning on E85, you'll never want to use gasoline again. Good luck
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