I have a FCD.

Well right now if I put it in 5th gear and punch it going about 55 or so, it starts to build boost and stays in the rich. Right when it gets to 2 psi it starts to make it's way to stoich and then at about 3 psi it goes to lean.

I was told to measure my disk in my FMU. When I got it, they said it was a 12:1 fmu, but it has a seating ring with the disk and I was read that a 12:1 isn't suppose to have a seating ring in it. It's a Vortech FMU.

Side port is going to the stock FPR and the bottom port (opposite of vacuum source) is going to the return of the fuel tank. I might retry my friends 12:1 fmu again and make sure the vacuum line isn't pinching on anything.