Just fired up my brand new rebuilt 1970 350LT-1, and after breaking in the cam for a 30 min period, I changed the oil readjusted all my valves and fired it back up to set the timing, dwell, and carb. When I was setting my timing to 8 degrees as per factory setting with the vaccum hose off the distributor my timing mark on the crank periodically flucuates not staying in one steady rythm?? Does anyone know what causes that?? I did set my dwell to 30 and they are saying anywhere between 29 to 31 is the factory setting. I adjusted my idle speed air mixture screws but the timing still flucuates. Is there an actual procedure on what should be adjusted first to last? The engine seems to be running very strong, smells a little on the rich side!!! but maybe the idle screws need adjusted again!!! is there a proper way to adjust them?? And lastly how do you set your total timing ?? I hear different people saying to set your total timing the engine will perform much better!!! I never heard of that ... I know this was a lot of information but if someone could give me some advise I would greatly appreciate it.