The '71 Charger 500" stroker uses the stock 26" radiator, and the old Mopar performance water pump housing and pump, along with the Mopar Viscous fan package.
It has worked for years, but it really could use a better radiator.
Fuel supply depends on power level, fuel type, and fuel pressure.
When I was running a carb with E-85, I used -8 AN (1/2") fuel lines with about 12psi at the rear mounted pump and 6-psi at the by-pass regulator.
When I put EFI on, the pump and most of the lines are -6 AN (3/8"). The internal fuel pump in the fuel cell normally supplies 3-bar pressure (58-psi) to the EFI regulator when there is no manifold vacuum. The pump is capable of higher pressure if you run boost on the engine. I don't, the main change is the pump will require more power current as the pressure increases.
I do a few common mods to the oiling system. Enlarging (reaming) the main oil supply holes larger, cleaning up matching the oil pump suction side of the pump and block. Reaming the supply to pump passages to 9/16", and rounding the 90-degree intersection going to the pump.
I usually enlarge the oil pump pickup boss to accept a 1/2" oil pickup tube. If doing a mild lower reving engine, might not need it. The 500" engine will rev 7,000 RPM. It also has the Milodon low-profile oil pan (I think 7-quart capacity).
Many modifications depend on the power level and RPM more than just the stroke size of the crank.