1972-up ECS hoses connection

The other canister has the same caracteristic : a built-in purge valve, which is connected onto the distributor vacuum, and which turn the system inactive at idle.
And yes, in theory this system has no effect on idle quality and turns easy the hot starts.... in theory.

Do you think the 1971 system, with only a breather cap, is as effective?
My slant six starts instantly when hot and has a very regular idle.
But the exhaust gases smell unburned fuel and stings the eyes. Would a charcoal canister correct this? Or maybe only a too much rich idle mixture? I don't know.