Fuel regulator won't fit fuel rails (pic)
 

I just bought some aluminum fuel rails and now my fuel regulator doesn't fit. How does the regulator mount?

http://www.fbody.com/members/LarryS/fuelrails.JPG

You'll need to use an in-line regulator like one from Aeromotive, Barry Grant, Holley, etc. Pro-M makes a fuel regulator block that lets you use the stock type FPR with their billet rail setup but I'm not sure if they sell it separately. You could call and ask. You'll also need some fuel line adapters (Aeromotive or Downs Ford) to transition from the stock lines to the braided lines; unless you're replacing the stock lines all the way back to the tank that is.

Thanks Jeff, I'll check with ProM and see if I can make their block work. I have an adjustible regulator already and sure don't want to buy another.