I can't give you an accurate guess for the cost of the underhood paint. Go here and you will see that I had a lot of other work done as well. http://www.gelsimustangworld.com/index.html
Absolutely beautiful car and perfect engine compartment! Great job! Do you plan on taking it to the strip? I would love to know what it runs.
I got them through a little local mustang shop called BILLS COLLECTIBLES. But you can certainly get them through Mustangs + and undoubtedly straight from the manufacturer. Love the 17's.