Finally some Dany's Mag swap progress, and fuel line routing questions?

So my Googlefu is usually pretty good, but I am not finding anyone with the 3/8 filter with the return in stock (except 1 GM restoration place, $149..lol)

But I am finding lots of the 5/16 version for $6 or $7.
I have a 3/8 sender on its way with a 1/4 return fitting.

Would we be nuts to redo the system in 3/8 from the tank all the way to the pump, with a 1/4 return, then leave the existing 5/16 line to the regulator and from the regulator to the carb so as to be able to use the 5/16 filter?