I don't think the pump would heat the fuel any more than the natural ambient temperature outside the car would - and heat reflection off the road or carparks....that heats the fuel up.
I went with a custom-made aluminium tank complete with internal baffles to prevent weight shift when cornering. The guys who made my tank make tanks all the time for high-dollar pleasure boats and yachts etc. Pressure tested, and running the Holley in-tank pump now....has a drain section for emptying out if necessary. Running all AN fittings and braided hose. I'm not chancing anything to barb fittings and rubber hose with 58.5 lbs of pressure constantly flowing.