A continuous fuel return will not overheat your fuel tank, in most cases it cools by the fuel simple movement. The return line can be add to the filler neck when no other option is available and works fine there. A rear mounted electric pump will solve vapor lock in most cases, especially with a return line and regulator. As tech says NO carburetor needs more than 5psi.

A phenolic spacer will help with heat soak, however too much heat is just too much heat. A slick easy way to solve header heat (stole from another forum);
https://www.heatshieldproducts.com/a...eld-insulation

A fuel stabilizer (and or other products) will solve the disadvantages of ethanol blended fuels;
https://www.goldeagle.com/tips-tools...tment-instead/

It is nearly impossible to get fuel without ethanol and some that claim their fuel is without ethanol are actually saying they are just below the amount required to report;
https://www.eia.gov/tools/faqs/faq.php?id=27&t=10