Rich --
We started with 43 #'s which is what all (I should say the "standard") injectors are "rated" at. We couldn't get past a lean spot in the middle of the RPM band so dialed it up to 45#'s and that "fixed" it.
YES - the fuel pressure regulator is vacuum referenced. SO we set the FP without the engine running (or you just disconnect the vac line) and then we didn't have to deal with a vacuum leak - even momentary - during the ECU's learning curve.
I'm using 36 # injectors...
One thing Tom Nelson and I discussed during my visit to his shop (way fun) was how LEAN the 8 stacks tend to go when you crack them open. Makes sense to me - given the area of the butterfly - and it's direct runner to the cylinder. It's what gives these systems their instantaneous throttle response.
Tom has a video posted of his 406 - 8 stack efi motor on YouTube.
https://www.youtube.com/watch?v=ZT6Wa5A68bQ
Unfortunately (for me) I planned to video my dyno time with my new little GoPro HD camera - but due to operator error... (and poor planning) I got lots of video of setting up the motor - and all the banter etc - and not one single second of the motor running! DOH! But I can tell you - that with this EZ EFI - my motor is batch fired (bank to bank) and sounds every bit as crisp and with every bit as quick of throttle response as his motor sounds. I'm running smaller heads so don't have the top HP numbers (it runs out of air flow at 6000 RPMS and the numbers clearly show that). But my motor made more 30#'s more TQ and only missed his 530 HP number by 4.6 HP....
