Vented fuel cap

None of these cars use nor SHOULD they use vented caps. A vented cap is going to allow fuel to splash all over your fender

If I "had one of these" and wanted to get rig of all the carbon can stuff I would take the time to pull the filler pipe out and weld / braze / silver braze a fitting into the upper end of the filler, and duplicate the older 69/ earlier vent.

If the original carbon can vent line coming up front from the tank is there, is open, and in good shape, you can just bring it up high so it won't siphon and it will act as a vent. Might be good to plumb it into the air filter bonnet to reduce the chance of fumes (smell)