I am not suggesting it is good simply letting people know where I am. How can I test it? I know when I was setting the timing I forgot to plug the vacuum line the first time and my advance was way high it came back down once I plugged the line.
disconnect the vac line and check timing at idle...
then rev the engine until you see the timing increasing, increase rpm till it stops changing... that will be your total number and rpm spec...
so total - idle gives true mechanical adv.
now for vac hook at vac tester (at idle), no pump that thing up to like 21" of vacuum(or 2 more than highest vacuum @ cruize)... this will give you vac advance number...
if there anywhere near where i said then you'll have to take it to someone with a dizzy machine and set it up for you...