Charcoal Can Fans, should I?

I have a 1973 Duster that is restored to pretty much stock. It does have an LD340, aluminum radiator, flip top gas cap retrofit, and a new A/C system so those are the things that appear non-stock. I have been wanting to paint the radiator black to make it look more stock.

The stock thing is just for appearance but I was looking at a Wanted thread about a charcoal canister. I have one that never got re-installed. I don't even know if the tank is vented or non-vented. Can anyone clarify on what cars got them? My car was a California car. I don't remember the exact routing of the fuel lines right now. The gas cap is a retrofitted flip top so I don't think it vents.

I'm not over the top about the car appearing 100% stock so I'm not dying to put the canister on it, however, I will crawl under the car to see if the tank is vented. I got the car after the paint was done, tank installed and drivetrain installed. If the tank is vented then I may as well clean the canister up and put it on if it doesn't rob any performance. The only upgrades performance wise are the LD340 intake and a single pattern 224 @ .050 cam.

Thanks