Clubs and Organizations
One sad fact of classic car restoration is that the only people who can truly appreciate the hundreds of hours and thousands of dollars you put into your project are people who have done the same. Sure, it's a great feeling to see your project sitting there finished in the garage, sparkling with a new coat of paint, the chrome gleaming in the glow of your shop light. But it's also nice to kick the tires and look under the hood with guys (or gals!) who know the look of quality work when they see it.
Joining a club is the on-the-ground version of an Internet forum -- a perfect place to talk about the parts you have and ask about the parts you need.