Timing Retarded

I do not think I can read anymore. I jumped to conclusion that timing would not advance because it would would not go 40 mph. The stock timing is 2.5 deg, and dwell is 40 to 45 deg, but more timing is often used. Now I understand it is a problem in adjustment as 67dart273 suggests. It is still important to verify the vacuum advance, and mechanical advance is working correctly.