Dipshit Fuel Line Question

Id think the wheelbase would dictate what fuel line you could adapt. Why are you going with a vapor return? solid fuel return from a regulator? Vixens filler has a vent to air already: could you just vent it to your air cleaner? My Mazda has a snorkle air cleaner with a evap shutter, closes with no engine vacuum so as not to stink up the garage. WOT never gets low enough to shut it.