I ran a hose direct from the vent in my 72 pre-L out to the atmosphere with no filter. I never really smelled fuel unless I filled the tank really full.
However, I was running a Holley carb at that time.
I'm switching to EFI, sniper 2, while the engine is getting sleeved so will be curious if I get the smells with the new system. I'm using an external fuel pump with a return line so will be different for my 2.0 project.
JW