Color choice?

Paint it whatever color floats your boat, I wouldn't even limit my self to a 69 color or even a mopar color. Same for the top, if you like the look put it on, if you don't don't.

A 69 Barracuda numbers matching or not is not a big buck car that you have to consider whether you are going to impact it's value by 10's of thousands of dollars by changing the color.

Personally I like Sub-Lime! :)