There are 2 listings in Hemmings for hood hinge rebuilders - Rowland Hall, (818) 845-3574, CA (no web site), and SMS Auto Restoration Services, www.sms-auto.com
, 800-989-6660, NH. I have not tried either yet. Rowland lists capabilities as rebuilding to original condition, reboring rivet holes and using new (correctly marked) rivets, and finishes including powder coat, zinc iridite and phosphate. If you do try either, be sure and share your experiences with the rest of us. If either can rebuild for less than a nominal NOS price, it's worth it in my estimation. I don't like repops. There are probably additional people out there; I have had good luck using Hemmings advertisers for many years.
One tip for aligning hinges - mark or outline the position of your old ones before removing them. You'll have three directions and panels to consider, plus the latch, so go slooowly when you are test closing the hood. You may get the gaps right, and then discover the hood is too low in the back, or too high compared to the cowl grille. Side to side is affected by the position of the hinges on the underside of the hood. After messing with it for a while, I quickly began to admire the assembly line techs - they only have a few brief moments to get hinges and hood installed and adjusted. Practice makes perfect -