69 Chevelle BB fuel line requirement

[Woj]

I'm working on a project I bought a few weeks back, it is a 69 Chevelle 300 deluxe hard top, with a 427/TH400, factory AC car. Originally it had a 307/TH350. It currently has a single 5/16" fuel line; I want to change it to a 3/8" fuel line and use a quadrajet carb (don't laugh, I've got a guy that really knows how to make them work well).

It seems like many of the HP Chevrolets that used the quadrajet also had a 1/4"return line.

Does anyone know if the return line is necessary with the q-jet Big Block configuration?

My goal is to make it a great running, street-friendly car with a stock appearance. The engine and trans have been previously rebuilt.

Any thoughts would be appreciated.

Thanks.

Phil Woj

A few pix for the curious: