I just finished getting this worked out, and I thought I would post this here in case someone needs it in the future.
On the pressure regulator side you need one of these
https://smile.amazon.com/gp/product/B003CGSUL0/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
It is a GM EFI to An6 male straight adapter.
Note that you want a steel one, because you will need to heat it in order to bend it. The engine bolt right below the fuel pressure regulator interferes, so you have to modify it. I broke an aluminum one trying to heat and bend it.
I drilled a 5/16" hole in a block of aluminum, heated the middle of the tube, stuck a big socket loosely over the threads, and bent it slowly by hand.
an AN6 45 to hose finishes this end.
On the other end, you will need an AN6 straight to hose fitting, and this:
https://smile.amazon.com/gp/product/B000CNB8NS/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1
It is 14mm
That's it.
FYI the output from the pump is the same type part, but 16mm in case anyone ever needs it. https://smile.amazon.com/gp/product/B0049D7ZSO/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
Hope this helps someone. It was a pita to get the right parts figured out.
Dan