Nice ride dude! Looks sharp!
I have that same coolant overflow bottle in my car. Like Jim said, it's probably from an Olds or Monte. I think my car was in some kind of fender-bender before I bought it, and whoever replaced the bottle replaced it with the wrong one. I've really been meaning to replace it with the proper TR overflow. Whenever I get on the gas hard, coolant seems to make its way out past the cap.
Good luck with the car!
Steve