Ideas on running a fuel return line

I'm a HUGE believer in vapor return systems. First one I ever saw was on my '70RR 440sixpack. If you are running new 3/8 line, you can either use your old existing 5/16, or if you had a vapor can, it SHOULD already have a second line back?? to the tank, you could use that.

Wix makes a couple of filters, one 5/16, one 3/8, and I ALWAYS have a hell of a time looking them up. They have a 1/4" output for the vapor, which must be mounted "up." the filter can either be mounted vertically or horizontally, so long as the 1/4 fitting is "up."

I believe, Wix no 33040, 33041, same no. from NAPA without the first "3"