An other question for my 1989 Chevy Caprice Wagon: The engine is a 307 (The Oldsmobile) and with carburetor 4 barrels and my question is: can I replace the actual whole air filter and put a simple round air filter? Can that will affect the whole balance? I try to check why the engine run beautifully cold, and when hot it loose power, hesitate, and knock. I have to go with the lower transmission gear (2) to regain some power. Any thought will be fantastic. Thanks.