73 duster vented gas tank ?

This is an early abody tank for my barracuda set up for fuel injection - electric fuel pump in the tank.
If you look at the photo one vent line from the pump “y” with the top nipple on the tank. This is where you attach the roll over valve if you don’t have the factory set up.
If your tank is factory style then you have only one nipple to attach to.

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