The fitting on the bottom of the regulator came from
www.discounthydraulichose.com and is part# 9069-06-14 (90° Elbow, 3/8" Male JIC x M14x1.5 Male Metric Adj. (Steel))
That will allow you to connect a -6 AN female hose to the bottom of the regulator.
The -6 hose is from NOS. I ordered it from Summit Racing, part 15480NOS. 16ft long.
The fitting at the end of the hose is a -6AN Male to 5/16" Barb, which I got from Jegs, part # 027-15635. You could most likely get the hose there also.
Then I bought a short piece of 5/16" efi fuel hose, like a foot long, to connect to the original return line above the rear axle (try to find some J30R9 hose, or J30R10 is even better). Now the problem is, the original return line is 1/4", so the 5/16" hose is a little big. So I put 2 clamps on there to make sure it doesn't leak. I don't really like that idea, but at the time, I could not find a -6AN male to 1/4" barb adapter.
So that's pretty much it: the regulator to -6 adapter, the 16ft -6 hose, and the -6 hose barb adapter. I'm sure there are other ways to do it, but this worked well to get the idle pressure down.