I'm right there, the '68 Camaro was my dream car growing up, and as an adult a '65 Vette has always caught my eye (I'm a '65 model myself).I'm a Chevy guy through and through, but I'd take that Mustang any day of the week out of those 3 choices. With that said, from the same era, I'd take a 68 Camaro 427 over any of those, and 63 Stingray above all else!
My Dad raced short tracks in the 50's and again late 60's and early 70's. He ran 302 Z-28 engines, bought them from one of the Bham dealers, and gave an extra one in the crate to the guy when he sold his last race car.