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Injectors are too small, 2.5" will be too small (2.75" may be enough) .
I dont know about that turbo, only garretts. a gtx3071 would be quite nice and provide a bit of headroom.
On e85, a gt2871r A/R .86 will net you about 400 HP @ around 1.8 bar . I would recommend high Z ID 1000's or high Z FICs, this way you can bin the dropping resistor and use the ECU the way it was intended first (it has a highZ driver).
If you stick to a MAF management, Z32 one is the way to go.
as far as i can tell about the cams you dont want too much opening nor lift. 260/ 10mm is already a bit too much imho. I think 250-256in/9mm 260-264ex/9.5mm will be already quite a lot for high rpms. Dont forget this is NOT an NA engine, and you will be boosting a lot. You dont want much overlap.
Why do you want to rev to 9000 ? It really brings a lot of troubles (Bigger/faster injectors, water pump nearly cavitating, need of underdrive pulley, oil return flow starts to have a hard time, you need a perfectly balanced crank/rod/piston/flywheel assembly and so on) standard lifters can do up to 7500/8000 quite reliably, i suggest you stay there.
that and you will eat through gearboxes with that power level.
ECU wise, a nisture is able to manage that kind of power. I would not go megasquirt unless you know what you are doing, as you wont get any support (most CA owners use nistune / powerFC/ off the shelf chips)
considering the diff, i am quite surprised by what you say, but maybe you got a shorter diff than i have. Anyway, a Z32 gearbox would solve both the gearbox strengh and the gear ratio problem. Or you could get an S14 diff, they are longer than the S13 ones.
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