so what I mean by putting in Dry is just to plug tyhe 5/16 sender return until you are ready to make the final connection.
Now heat soak. after shutdown the fuel boils in the lines bowls and causes hard or no start. Todays reformulated gas has a low distillation curve.
summer blend pure gas starts boiling near 170 degrees, E-10 around 140 degrees. winter blend is even lower. the change over is in May usually so get fresh summer gas.
Pure gives you a little advantage.
Now you deal with 3 Heat types Conductive, Radiant, and Convective. The fix for conductive heat, metal to metal, is a phenolic spacer under the carb,Check with "DashMan" on the web he has a site and sells the Phenolic spacers and will get you the right one.
Next is radiant heat, it effects some carbs more than others Holley and QFT hang the bowls out over the intake , it gets hot and radiates heat to the bowl. some Carbs have more internal bowls and not so much of a problem, but your fuel lines and filter get radiant heat as well. The fix for Holley and QFT is radiant heat shields under the carb. Holley sells them, Mr Gasket and "Cool Carb" has one that acts as both a phenolic spacer and radiant heat blocker. It just cannot be used if your exhaust crossover is open.
mine is, so I use the aluminum shields with DEI heat tape on them. Your fuel lines can be kept cool with DEI fire sleeve. Summit and Jegs sell it or DEI direct.
Convective heat is another challenge, when the hood is shut after a long drive the under hood temps get very hot like an oven, and boil the gas..phenolic spacer or not.
when you stop at the car show open the hood all the way, it helps the heat leave. Some guys say they don't have the problem but only drive to the car show and open the hood for 3 hours and they are ok. The real test is drive for an hour at highway speeds and then go in a restaurant for an hour with the hood shut, different story.
I use fans on time delay relays to dissippate that heat on real hot days and it works good.
Alternatively you can get fuel injection and because the fuel is under pressure you don't have these problems, it's boiling point is raised by the pressure.
best 2 things run a return line any way you choose and use a phenolic spacer. Then see how things go.