Just to follow up on this,
I tried the timing light again and it doesn't seem to be moving even half as much. jumps maybe a degree or 2 but not half as bad now... hmm maybe the dizzy was too loose the first time?
it seems as if the normal Alan type screw that goes in the top of the rocker was missing or something and the previous owner put a bolt in there that has a 9/16" head on it, maybe this (bolt) isn't holding the rocker where it should be?? Letting it back out some and causing the tapp tapp tick . Anyways I have a friend coming over tomorrow that's a GM tech hopefully he can get this all straightened out... thanks to those who have replied and I will give updates as I figure more out.