Painting over original 1969 lacquer paint??

[g356gear]

Hey guys,
I have a 69 Camaro that was painted 20 years ago with base/clear enamel over a lacquer paint job. The entire car was shot with a primer sealer before the enamel was layed down but now there is an issue. As the car has been sitting so long, over time, there are several spots where the paint has lifted making it look like many smalll bubbles under the paint. Obviously the car needs to be painted again but what would be the recommendations for the new paint? Take it down to the original factory lacquer and then what?

The car was painted once back in the late 70's and the color of the car was changed at that point. Problem is that the car had a ton of hours of body work getting it laser straight with that paint job. I think that is why it wasn't taken down when it was refreshed in 89, just sanded down, primed and re-shot. Taking it down to the metal is not really an option for me. I do however want to change back to the original color.