Building a T76 383, shooting for around 600+ to the wheels. What size and type(seimens, EV1, EV6, EV14, short, standard, delphi, bosch) of injectors should I be looking for. E85 might be a possibility. I know they make up to 200lbs in high impedance, but I won't be needing that high.

 

Style is EV1.
Length is long IIRC (someone can correct me if I am wrong). A knowledgeable vendor will know what is a direct fit for an LT1.
Brand is dealer's choice. I use the Mototron, but have read they are identical to the Seimens, IDK. With your power output, choices will be limited.
Size (flow rate) can be calculated (ballpark) using an on-line calculator, such as http://www.rceng.com/technical.aspx
Some assumptions must be made:
With an automatic, you can assume ~18% drivetrain loss, so 600+ rwhp will equate to ~750 crank hp.
bsfc will be .60 to .65 for a turbo, you can finagle the math.
Will you be using stock fuel pressure of 43.5 psi? That will also be a factor.
IDK about E85, except that the size must be tailored (upward) if that is what you want to run.

 

Going off that calculator, it looks like 80lb injectors would be good for 600 to the wheels with 80% duty cycle. I'm still tossing around the idea of E85.

 

Also fuel pressure will be adjusted to whatever it needs to be to get desired duty cycle and fuel to the motor.

 

Duty cycle is part of your injector size calculation.

 

If I max out a 80 lb injector on stock 43.5 psi then I will raise the fuel pressure to lower the duty cycle.

 

What duty cycle did you put into the calculator to get the 80 #/HR size? Hopefully, no more than 85%.

Why are you assuming your calculation gave you an injector that was too small, requiring you to play with fuel pressure? Nothing wrong with running a higher pressure, I run as 58psi (4 bar), but I knew that when I calculated the injector size.

 

I think I put 80% duty cycle with the stock fuel pressure and it worked out to be 80lb injectors. I just picked up some seimens 80 lbers for a good deal so everything worked out. I don't know how hard i'll push the motor yet, but these should be enough even with stock fuel pressure.