Ummm, well for Edelbrock parts, I'd suggest Summitracing.com or Jegs. Both are huge, fairly priced, and have excellent customer service. I'm partial to Summit, because they have the fastest order to shipment rate I have ever experience. I've only had one order take more than three days to deliver and that's because I ordered $3000 worth of parts and they needed to verify I actually ordered them (love that security). Otherwise. Paddock, and California
Mustang have a very good selection of vintage mustang parts. Third, I'd suggest picking up a copy of Mustang Monthly because they focus on vintage cars and a lot of their advertisers have the parts your looking for or other alternitives. Hope this helps.