Car looks great. I'm sure you will enjoy. Are you going to keep the 200, or convert to V8? Whatever you decide to do, any part you want or need is available so no more scavenging for Pinto parts!
I love the more refined look of the 66 vs the 65. The dash, the grill, and side ornaments are my favorite parts vs 65. I had two 66's in the 1980-83 timeframe and would love to own a 66 convertible, but I probably won't. I tell myself, "No more car projects" after the current project is done. If I did get a 66 convertible, it would get the Shelby treatment as a clone of the 4 that were built in 66. I will have to be happy with the 67 Fastback and the 67 Coupe/80 Pinto project I am currently working on.
I know you'll probably migrate to Mustang sites, but check in from time to time to contribute. I have had several vintage Mustangs so let me know if you have questions. Maybe I can help.