Tank selector valve area pics ?

[Pyrotechnic]

Does anyone have pics of the selector valve area on a unmolested truck ?

Reason is, I suspect some rigging on my truck. The outlet fitting looks like 5/16's instead of 3/8, and the way it's mounted does not look stock. I've seen other selector valves on other trucks in the past, and this one just doesn't match up.

EDIT: Also, the valve currently on the truck is a 2 in, 1 out valve. The vents that are on the fuel tanks consist of a short length of hose, then a plastic breather exactly like the kind for a rear axle vent. This truck is a Heavy Half and had little to no emissions equipment from the factory. I've search through posts and many specify a 6 port valve, which makes sense for a TBI setup, but not for a carb ? I don't see any reason to switch the vent lines ?