PABlueMach-1, All above posts have great info. As David stated there are advantages and disadvantages to both small and large stores. Smaller ones with less overhead may offer slightly better prices while the larger stores may have a much broader product line. I have a lot of experience dealing with many different parts vendors, mostly Ford products. Part of my job responsibilities at the dealer I was at involved trying to keep up with the fleet of cars (Toys) the owner and his son owned. Just in an 18 month period I was searching for parts for a 31 Model A, 34 Ford V8, 62 Thunderbird Roadster, 63 Falcon Sprint,65 K code Mustang, and a 67 Mustang GT. I'll stop there even though there were some other Lincolns and T-Birds involved. Most were total ground up restorations and a total test of my patience. The Mustangs were not as bad since there are a large number of parts sources for them. What all this has been leading up to is the backorders, double talking sales people, broken or wrong parts, and (unfortunately) the poor attitude of the voice on the other end of the phone you will eventually end up dealing with.
IF...I had only know about Don @ Ohio Mustang Supply then, I could have saved myself a lot of grief and a lot less blood pressure medication. My Boss spent over 100K on the two GT Mustangs (the 67 did receive a 427 transplant) and every time I called to inquire about the never ending list of backorders and the return of parts THEY sent wrong, I got attitude from them!
So....I'll say it again. Call Don first! He is a Forum Member/Vendor here and is very knowledgeable on the 71-73's and will give you an honest answer if you want an opinion or info. Don and Mike @ Motor City Mustang both have parts cars and can help you in case you need something that just isn't available other than used.
Also need to remember that since our cars are not part of the 65-70 Club, we are still considered "Outsiders". Something Don will never do!! OK, I'm done with my rant! :whistling: