since were on the subject, would it make sense to put that filter/breather right at the tank and just remove all that extra breather line?
that should also keep the fumes away from the cab
That might be possible but 1970 cars had a unique clean-air package with that breather and also an odd foot-long metal tube in the trunk next to the gas filler tube which vents the tank and collects condensed gasoline vapors. My '70 Duster came with this setup; I got an old charcoal canister from the forum here and just connected the vapor hard line under the hood to the inlet on the canister instead and just ditched the breather; it's kind of a pain to remove all the hard lines and such for the 'Clean Air System'. I have no problem with fumes building up when I park it in the garage after a drive, but before I put in the charcoal canister I just had the lines disconnected and open and I DID have noticeable vapor buildup (smell) then.