Finally got the car done and back on the dyno yesterday afternoon. New numbers: 632 rwhp, 554 rwtq on a Mustang dyno.
The coolest thing was the curves- torque was flat all the way through the test and horsepower just continued to climb. I'm extremely happy and will be at Bandimere for test and tune Wednesday for tech and a few blasts. The new torque convertor is perfect and the tranny seems tight and crisp. Here's the dyno sheet: