I've got a 70 145S with B20B engine, and also have '71 volvo FSM which should be pretty good for the '70.

I was sucking on the dizzy vacuum dashpot with a Mightyvac and got no response. Upon reading up in the FSM I was most suprised to read that B20B dizzy has VACUUM RETARD, not vacuum advance which is what I've seen on dozens of other cars I have worked on. Vaccum advance is generally considered to improve driveability and economy at part throttle conditions.

Also, I cannot figure out from the manual where vacuum dashpot is supposed to be hooked up. Does it connect to the normal vacuum port that gets suction immediately upstream of carb throttle butterfly? (I've got the IPD Weber DGV kit and this is the only vacuum port available.)

Can anyone tell me what is up with VACUUM RETARD function???

Should I ditch this dizzy and find one with a proper vacuum advance ???

Also, I've been thinking of converting to elec ign with the Petronix kit from IPD.

What options do you all recommend ?

Thanks in advance !
I'm really enjoying the folks on this forum.

Later,
Al