Bob:
You should inquire as to whether your speed shop is familiar with either the LS-2 edit or the HP Tuners software. If they are they could do some tuning adjustments for you or at least give you some idea as to the types of things they can optimize. Since you're going to be on the dyno, why not check it out.
Chuck
If you're interested I have the dyno reports from D3 reflecting the stock V and then enhanced with their stage 1 and stage 2 products. It would be interesting to compare your results with theirs.