How do I stop vapor lock?
I think it's funny how many people think having air in a fuel filter means something is wrong.
It doesn't, but hard hot-starting or sputtering and quitting on the side of the road is a problem. If the filter is completely empty, it might maybe could possibly be a hint at why the car died. Finding nothing but vapor behind the fuel pump is another hint.
Fact is, gasoline today isn't the same as it was when these cars were new and people's expectations of cars is VASTLY different today too. Not to mention that so few of these cars are as-equipped the day they left the show room! Headers, open element air cleaners, different gears, torque converters, etc.. they all have an effect.
The quick fix is to shield the incoming fuel from heat - this is a marginal one.
The next quickest is an electric fuel pump that dead-heads at the carb.
Running a return is a great idea, but requires some fab work that if someone needs to ask 'how' probably is beyond their abilities.
Repurposing the vent line as a return and then brazing or soldering a vent onto the sending unit (once removed from the tank!) with a roll-over valve attached and positioned as high as the filler neck is simple, but requires tools that not everyone has or can use. An electric pump requires a couple wires, screwdriver, some hose, and a relay - far easier for the typical shadetree type.