Sounds like a good time.
As for your modifications, you will have a difficult time getting a converter for that car due to the limited aftermarket currenlty, and the converters that are available for the 6l80 are a FORTUNE, and not worth the price in my opinion.
I would consider a air intake (Vararam makes a very good unit) , 160 degree thermostat, then i am not sure your comfort with exhaust modifications, but I would get a set of long tubes and x pipe, and leave the stock axle back, and the car should make around 410-425 rear wheel horsepower after tuning, about a 40-50 horsepower gain from where the car is at now, this should lower the E.T, and make the car much more enjoyable to drive. If you would like I encourage you to stop by our shop, we are very well known in the corvette market and should be able to discuss any option you would like to pursue with the car, and having most items in-stock, and in house tuning is certainly a great benefit to take advantage of.
Regards