I just had a guy rebuild my carb. and adjust my timing, he said he set my timing to TDC, which doesn't seem right to me... The car is also a good noticeable difference slower than when I gave him the car. He said he also disconnected the secondaries on the carb, he said that it didn't need them. I've got a 306, and the carb is a Holley 4160 4bbl 600CFM. Anyone have any advice on why the car is slower??