HELP! Our Homecoming trip could be in danger!

[nolastyankee]

The Spence car is on track to make a debut at Homecoming this year with one, significant glaring exception that is placing our trip somewhat in jeopardy - the car is undrivable.

We are running an Accel DFI fuel injection system and the motor is only developing 7" - 12" of vacuum (idle to run) which is driving the MAP sensor nuts. I can re-scale the entire fuel strategy to match the low vacuum, but this really does not seem right for the motor. I'm looking for any advice or suggestions that the group may have on why my vacuum may be so far off. Here's what we know to date:

1. 351W, 0.030 over, 9.1 compression
2. 224/232 at 0.50 cam with .555/.565 lift on 1.6 rockers. 108 intake centerline with 112 degree separation. Both Comp Cams and Cam Motion have validated the grind for the combination. Comp indicates 13" of vacuum is normal for the cam, everyone else in the world I have talked to says no way, cam should pull at least 18"
3. Auto trans with 2500 stall
4. Cranking compression is 155# or 160# for 6 holes, other 2 holes are at 150# and 152.5#
5. Valve covers are not pulling vacuum, propane tests suggest no vacuum leaks
6. Vacuum readings on the MAP have been validated by a gauge
7. Only vacuum pulling off the plenum is for the MAP and fuel regulator, everything else is sealed up
8. I think I recall degreeing the cam, and definitely remember installing it straight up and even getting a second opinion to ensure the cam was installed on the right tooth. I haven't gone back to validate this yet because I am trying to avoid yanking off the timing cover.
9. I have taken the car from 20 degrees to 45 degrees of initial timing to see if there was a serious retard issue. (A serious issue with the timing that is. We know there is a serious retard issue with the mechanic. )

I'm at my wit's end and looking for some help. If you have any advice or know anyone I can call please let me know!

(Funny story - I did get the car around the block a few times with a seriously modified fueling strategy...I got into the throttle a little farther than planned and outside of my adjusted fuel map. The EFI dumped a bunch a gas into the motor and the backfire in the manifold launched one of the breather covers over the top of the car. Once I cleaned my pants and determined nothing was hurt as a result my neighbors and I all had a good laugh!)