not sure if it would help you, Campbell automotive in Edmonton, Alberta, Canada has done lots with the buicks @ syty's. you might find some posts regarding their work on this sight. just had my engine work done and dyno'd with them and it turned out great i know they do international orders and the like and have a lot of tuning experience as well. here's some contact info :
Campbell Automotive
14631 - 119 Ave. Edmonton, Alberta
T5L 2N9
P (780) 452-3535
F (780) 452-4200