Back when I was a teenager, my folks had the same LTD wagon. That thing was BADASS, and it was the best car for going to the drive-in with the girlfriend. Lots of space in the back with the rear seats down.
It's always sad to hear when a LHS shop closes it's doors. I'm lucky to have 4 LHS's with-in an hours drive of my door. We in Ontario don't have the big box hobby stores like you guys in the states do. And Wal-Mart in Canada still don't sell model kits like they use to so I support my LHS.
The Pantone book your being quoted is the one used to match Pantone colours when using the 4 colour process system when making plates it's called a screen value book. It's not the right book. He needs to find a Pantone Matching book that is used for matching stand alone colours, which I have one. The formula for PMS 376c Green is as follows,
Yellow : 78.00 %
Green : 22.00 %
Total = 100.00 %
Use this formula to match the colour you need. You may need to add more green to get the proper tone depending on the primer colour you use. Test on plastic spoons to get it right. Good luck.