Well
#2 i am not sure but that looks to high up on the cab to be for timed vacuum, but I have wrong before
#1 I definitely the full manifold vacuum port. I hope you have not been running them uncapped as shown, that would cause a huge vacuum leak.
The one port is uncapped in the front carb as that is where my vacuum advance is normally connected, but I have to replace that hose. The rear carb has that port capped.
As for metering block for the secondaries, these run metering plates like many do.
