New fuel line - benefits of a larger line?

I'm way off from installing a new fuel line into my project 1967 Dodge Dart 270 (225cid slant-6, running a 1bbl Carter BBS carb). However, that day will come eventually and I'd rather plan ahead. The inner measurement of the stock fuel line was 5/16".

I'm happy to replace the fuel line with stock, but would there be any benefit to ordering a line with a measurement of 3/8"? I know I'd have to replace the sending unit (which is an aftermarket; the original one was completely shot and "un-recoverable" when I got the car). I don't intend to upgrade the carb, nor do I intend to alter the engine away from stock. This will be a street car, not a race car.

However, I know the Dodge brand. Every time they knew they needed to spend a dime, they tried to spend a nickel. I'm wondering whether a 3/8" line was optimal, but they put a 5/16" line in because it worked "well enough."

Does my question make sense? Feel free to ask questions if I've not been clear. Thanks!

[Also related: Would I be better off running fuel-injection hose from the sending unit all the way up to the fuel pump, or should I stick with OE / stainless steel?]