Rusty you do not have to talk down to me.At least that is what it sounds like to me.I appreciate your help.The msd advertises that it only puts 10 degrees timing in is not correct i know it puts in 20 because i put a timing light on it.I also drove and wrote down the vacuum readings at different rpms.Also put timing light on it and wrote down the timing at different rpms.I just did not know if 56 at cruise was to much when i plug in the vac advance.I did not tune the dist using the vac.I put in the springs to bring it all in at 2500 with 20 initial and 16 mechanical.I fully understand the meaning of the initial and the mechanical part and how they work.I know you lose vacuum when you are at full throttle . I was worried about at CRUISE if 56 was to much.You said earlier that it was okay and i agreed