A note on the ride height side of things, AW11's will have to be a bit higher, particularily if they have an exhaust that runs along the back of the car, as a combination of above ground dyno, short rear overhang and exhaust placement, the exhaust can end up resting on the rear strapping bar for the dyno.
Tree, if your after the a/f ratios on your dyno printout, 15-20min before your meant to go on the dyno, take the car for a quick drive and load it up a bit. Moisture in the exhaust doesn't properly clear out on idling and light load driving. The only reason they request that the moisture is out of the exhaust is due to the wideband sensors get destroyed quickly from moisture when put up the tailpipe on cars.
It should be an interesting day.