Still going over my engine bay trying to learn all that is there complicated by the air conditioning, power steering and PVC system. Looking at the service manual I might have a later PVC set up as on the 12 cylinder. First picture are the metal lines/tubes from the carburetors to the breather housing with screen at the top front end of the engine connected to the valve/camshaft covers. On the opposite side of this breather housing there is a single metal pipe/ tube running down behind the battery to a metal canister.

What does this canister do and does it require maintenance? I cannot see anything running into this canister from the other side but something might be there.

 

Finally found a page explaining the canister. The gas tank is not vented by way of a hole in the gas cap so as the gasoline in the tank expands due to heat any vapor travels by way of a pipe to the canister where it then travels to the breather at the front of the engine and then to the carburetors.

 

This should explain everything:

 

Very nice. Thank you!