Check out this shop. Nice folks to talk to on the phone, and they do custom stuff if you don't see what you want there.
http://www.rickshotrodshop.com/

I'm going to have them do the Aeromotive 1000 pump with a pair of #10 lines out/return, and have my stock size tank expanded 1 inch down and a few inches wider on each side. Not sure how much exactly until I fit the 3" TTI tips on the 1970 'Cuda. I'm hoping for 5 more gallons of fuel capacity.