95.555% of the time, emissions causes cars to be non street legal. I do belive superchargers are made for 351's but I don't know about turbo's. Personally I would rather take a little power to turn the supercharger than, restrict the exzaust with a turbo. Your brakes need changin on the caprice there buddy. 92 Caprice, sand it then re paint it or, if it's through the body and that isen't the best car with 170,000 on it just turn it in to a BONDO car.