I just bought a 1972 mustang 302 v8 grande.(thanks to the ones who helped) I'm looking for places to buy parts. Any suggestions?
Partsgeek.com
Autozone, eBay.
Rockauto.com carries a lot of parts for older vehicles. They typically have 5% discount coupons that are easy to find with an internet search, and sometimes they have closeouts where you can get great deals. To find closeouts for your vehicle, enter the following:
http://www.rockauto.com/RSS/vehiclefeeds.php?carcode=1132849&m=wc&l=en&html=true
(The carcode can be found by looking up your vehicle in the catalog, it will be the numbers at the end of the URL.)
WIth Rockauto you do have to watch shipping costs, when buying multiple items try to source them from the same warehouse. Their ordering system will flag this for you.
Start looking into Mustang Forums! Great place for the hard to find parts.