Have you replaced the fuel tank and lines. Mine was very rusty and every week I had to change the fuel filter. I would pour the gas out and it would be orange with rust. You can run yours with a fresh carb but check and change the fuel filter often. The fuel takk and lines are one of the best things I ever did to my car. I guarantee you will be replacing it sometime anyway. Mine is over 10 years old and I haven't had any issues.