Best way to vent fuel tank?

Those tanks are to be used with this vapor separator tube that goes in the trunk. I’m trying to figure this out as well. I’m going to reuse mine but not sure what to do with the 5th line that is supposed to go to the valve cover breather/pcv valve. I won’t be RJ. King stock valve covers. I’m thinking it could just vent to inside the frame rail.

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