Fuel Sending unit

I went ahead & ordered one of the 3/8" units a few minutes ago. I plan to replace my fuel line with 3/8" all of the way to the engine. It's probably overkill but I'm an old hotrodder at heart. I'm building a 408 6bbl engine & figure I might as well have the capacity to feed it. I also thought the return might come in handy in case I have any vapor lock issues. It would make it easy to run a return to help keep fuel cool.