I am a bit of a Chevy II junkie and believe that almost anything looks good on a 66. If the budget is tight, stay away from red; they are supposed to be the most expensive pigments. I would imagine that metallics and pearls are more expensive also. I would personally go with a clear coat, if you can afford it just from an appearance and maintenance stand point.
As you probably know, the prep work is the most important thing. If the car is straight go with as much as you like or can afford.
