Pertronix 1181 stock 72 350

[PbFut]

Originally Posted by Rich69shortfleet

1. Works best connected to manifold vacuum instead of ported vacuum and 2. Not all vacuum cans are the same, make sure you get the proper one for your particular application. Depends on the vacuum signal your engine makes at idle and full throttle.

A little ot but maybe good time to open a discussion on this point.
Regarding point one, why do you want full vacumm advance at idle?
Ported vacuum is shrouded from vacuum in the idle position. When you crack open the throttle plate the ported vacuum now sees intake vacuum. Depending on the load and plate position, could see near zero vacuum until the load drops and then vacuum begins to climb. With static timing adjusted correctly for idel, how does the non ported vacuum improve things? Don't you want a smooth vacuum curve off idea as vacuum climbs? What am I missing?