Well, I got the car on the dyno today and did some tuning to it. Right now, with a max of 17 degrees of timing and 15 psi of peak boost, the car made a best of about 454 hp/404 ft-lbs at the rear wheels, uncorrected (SAE 558 hp/497 ft-lbs).
There's more power in there and the fuel system appears to be fine, however, there's some issue with the system that we can't figure out. On every run, at some point, the AFR started trending lean. We would adjust the tune and the trend would move out to a later RPM, but it would still occur. It looks to me like the MAF is behaving as if it were pegged but it's only showing 4.6 volts max at 6k rpm.
So, right now, the AFR is below 12.5:1 all the way to 6500 and the timing is way conservative, so the motor is safe. But I won't spin her up to redline until we get an idea of what's up.
The car moves though. It's a whole different beast just using the middle of the curves :).