rubber vs steel fuel lines

[1972BackInBlackC10]

im putting a new fuel tank and sending unit in my truck and will be replacing the fuel lines, my question is should i run rubber fuel lines from the sending unit to the fuel pump? or should i reuse the hard liines and replace the rubber sections

my set up has rubber fuel lines then it goes to hard lines then back to rubber then back to hard line the back to rubber to the fuel pump lol just wondering if the hard lines are needed is all