Just a quick update on this car.
Ran at Speedweek 2013.
Tried wider tires, underbody strakes, and spoiler with maximum size spill plates. Ended up keeping only the spoiler and spill plates. That along with 21 psi of boost yielded us 276mph, 278 exit. This qualified us for the 263mph record.
On the record return run, trans did not lock up the torque converter or let us shift into overdrive consequently only ran 240 and failed to back her up.
It appears that the converter actually failed to lock up on the qualifying pass also as I had turned the engine fast enough to be going 305mph. I thought I was spinning the tires but it appears the converter was slipping during the run.
I believe the reason the car did not go into overdrive is that the converter clutch debris contaminated the trans fluid enough to cause the overdrive electric solenoid valve to stick.