Whatever you decide needs to be high pressure line, but I’m not sure I would use rubber even then.
I used 3/8 nylon 12 high pressure line even though I don’t run efi.
This is what I used for my supply and return both and has a 530 psi working capability and a 1,200 lb. burst rating.
It may seem like over kill, but for the cost and ease of routing it served the purpose well.
In my own opinion stainless steel line is always best, but...
JEGS 159235: Nylon Fuel Injection Hose 3/8" O.D. x 10" | JEGS
