There is not much out there. You can probally give Joe L. at Precision Turbo a call and see if he can burn one for you. There is also guys like Jay Carter and Jim Testa that burn chips but not too shure they can burn for a Hot Air Buick.
Maybe Chris might have some chips. I have a Kenne-Bell chip but too much boost for 92 unleaded. You will also need an adjustable fuel pressure regulator if you do any changes in timming and boost.
You could try to make your wastegate adjustabe so you can crank in a few more pounds of boost.