I've been doing a restoration on my "72 40. I put a GM HEI diz with vac advance. Question is, according to MAN-A-FRE you need a "ported" vaccum signal with vac advance distrib. Some sort of valve that retards the diz until the throttle is applied. This all makes sense, but I never even heard of one, let alone seen one. Any thoughts on this would be appreciated.
The article is in the MAN-A-FRE tech sec under FAQ webber carb fuel milage
The article is in the MAN-A-FRE tech sec under FAQ webber carb fuel milage