If your dizzy has a vacuum advance, then it would make sense to use it.


Should run smoother and be better on fuel at constant speeds with it connected.


I'm not sure that the vacuum signal from one carb will be smooth enough though.


One trick that MegaSquirt users do is to drill each inlet and join all 4 vacuum signals together - then add a moped fuel filter between the ECU and signal to act as a damper and smooth the signal out.


You might find that your timing is jumping all over the place with it plumbed into one port !