rebuilt 1600 stock w/counter crank, dual H32/34 pic solex's dual port heads, stock dist. (JFUR4) 1974 new points, w/dual vacuum ports, one advance and one retard, ques a. can I hook advance to left carb and retard to right carb? ques b. do I have to use two synchronize rs at at time or will one synchronizer at a time work? ques c. what should the vac read off of each carb ? Gene