New fuel system for the Dart

I ran a 512 big block 600hp on the same pump you currently have, the only provision I took to fight heat was a thick thermal gasket under the 900 cfm holley. Drove it everywhere in dam hot weather - no issues, just alot of gas $ pains. LOL
Good luck with your new system, keep us informed.
PS I ran the whole system in braided line, no aluminum that transfers heat.
My line from tank to engine compartment is stainless steel 3/8 hard line. The Holley heat shield kit came with a 3/8 thick gasket that is supposedly a thermal insulator also.