So, it's been a crazy busy day at work today, and I have not had the time to keep up with all this, I have read it all, but not digested in full. Just to answer the question about where I got the 8 inches of vacuum number, it came from Nate on the Edelbrock forum. My understanding is that he is the tech from Edelbrock directly set up as the moderator. It was his suggestion that it was a safe number. I want more then that anyway to run the brakes. I know I could run other options, but would rather spend my effort elsewhere. Now, for your consideration, Bullet Cams has submitted their cam design. It looks like a good safe bet, which is not a bad thing in my book. here is part of their email below.
Here is a camshaft grind to use for your 408 engine. This will make the vacuum
Needed for the injection. This will also have good sound.
Let me know if you have questions on this.
Thank you,
Chris
Intake
230 @.050”
.367” lobe lift, .587” with 1.6 rocker
284 duration @.006”
Exhaust
234 @.050”
.367” lobe lift, .587” with 1.6 rocker
288 duration @.006”
113 lobe separation
109 intake centerline