Does your carb have a vent tube from the float bowl?

Waste of time and money.  Who thinks up this stuff that adds nothing to the operation of the car?    Probably the guy that has his fuel line laying on top of the intake manifold so it can soak up all the heat..  Yep...that's the guy.

I think vapor will take care of itself as Hornman suggests.  An option to consider if you have vapor lock or fuel boiling issues is the use of a bypass style pressure regulator.  Any fuel that is not used is passed back to the tank in a return line so there is a steady supply of cooler fuel headed to the carb which lessens the chance of boilover.  However, at Denver's altitude and the modern ethanol percentages it is very hard to keep the fuel in the bowls from boiling.  I have tried spacers, different air cleaners that unshroud the air cleaner, etc.  On a hot day, all you have to do is hit a bump on the road and it upsets the fuel in the bowl and it is boiling out the vent tubes - especially on the secondary side that normally doesn't flow fuel.  I believe Chrysler and other car manufacturers used to use return/bypas style regulators to minimize boiling with factory mechanical fuel pumps.  If you are not having any problems with boiling fuel - I'd say leave it alone.  My solution on my truck was fuel injection.  The fuel isn't going to boil at 58 psi and the Sniper setup uses a bypass/return line so cool fuel is supplied.  So, if boiling is a problem, a return style regulator may help but if it doesn't work, you'll have a return line for your future fuel injection.  Again, if it isn't boiling or vapor locking, leave it alone.  If gas smell is a concern, some fuel will vaporize out of the carb but another source is any flexible fuel line. Some fuel vapor will seep through.  If you want to use flexible lines try Vapor Guard by Earl's (a Holley company).  They have a low-pressure version for carbs.

This an example of a return style regulator - there are other versions for less money.  I also linked a quick write-up that offers some benefits of a return system.

[url]https://www.speedwaymotors.com/Holley-12-803BP-Carbureted-Bypass-Fuel-Pressure-Regulator,141451.html?gclid=Cj0KCQjwpPHoBRC3ARIsALfx-_LCcjSrycizYpVuDCLR9xOQzZJUa_VZL7cu6zCLndf3ORAjMSh1tmMaAhpXEALw_wcB[/url]   


https://www.holley.com/blog/post/selecting_the_correct_regulator_for_your_car/