I have been working on my 68 GS California car, as my daughter has just turned 16 and likes to drive away with my daily driver. Despite some minor issues (Brakes?) the car has been running perfectly. Yesterday I went to use it for a quick trip to the supermarket and the car started right up, but when it came off high idle, it ran rough (missing). I was able to nurse it to the market and then back home, but today it is the same. As I said the car was running great, and nothing has changed or been worked on. It seems to me that there is excessive black smoke (too much fuel) coming out my left tail pipe. Also after shut down, I hear a gurgling from the carb and there was a little wafting of smoke from the carb as well? I am interested in the best approach to troubleshoot this and ideas on what has gone wrong. The car still starts immediately and runs. It did sit for years before this recent round of love. Thanks in advance for ideas and tips.