any 6 pak gurus out there?

thank you for all the replies.. I appreciate it. I have read the articles...I will look things over carefully and see how things go.i had expected a stronger vacuum signal from this cam. at least that's what the fella who sold me this combo said. it really doesn't matter where I try to set the timing 8 inches of vacuum is all I end up with.i will keep digging. failure is not an option.