1970 A Body Fuel Tanks

For those of you with a 1970 and the 4 vent EEC system that upgraded to the CR11E new tooling tank, where did you vent the tank? Filler neck? vented cap? Just looking at my options with this single vent tank. The website mentions plugging the single vent for a 1970. My current original 4 vent EEC system is in place and the steel vent line that runs up to the engine bay is just open at the end.