Power Chip for a 350

Does anyone know where i can buy a power chip for a 350 engine for my 91 Caprice Wagon. This weekend i bought a 93 Buick Roadmaster with a 350 with 40,000 miles on it. I am looking for a power chip that increases the timing and will increse the amount of fuel through the injectors to make more power. I plan to put it in my 91 wagon so the sooner anyone can get me information the better. Thanks.

look on ebay thats wheere i got mine