jim,
I pretty much agree with Hank.
You set the timing using by using 3 different areas.
Initial-
set by you with no vacum line hooked up. Ussually at idle and set to 12-20 degrees
Mechanical-
This portion comes with centrifical weights. Can be set with a moroso advance weight/spring kit Ussually ads 20-28 degrees at around 4K rpm
Vacum-
This will ad in timing going down the road, Ussually 10-15 degrees.
I would use a HEI and set
initial to 15 degrees
mechanical to 20 degrees to be all in by 2800 rpm
vacum to add 15 degrees at road vacum
initial 15+ mech 20= 35 degrees at 2800 rpm or more. You can add or subtract by changing the initial timing up / down. Tom
