The car is a 1940 Ford Deluxe with a 6 volt flathead. 59AB heads, crab style distributer, and I'm guessing around a '56 carb. I drove the car the other day and it ran fine until I returned home. It then shut off and would not restart. A few days later, after not attempting to start, I went to start the car and it took a few tries but it started. It had a knock on the right side of the engine with white smoke coming out of the exhaust on the right side. Black smoke coming out of the left side exhaust. The idle was so rough that I had to use the throttle to keep it running. Any recommendations would be great. Distributer has new points and carb was just rebuilt. Thanks