67 barracuda notchback restoration

At this time i am not sure if i want to just shoot the underside w GM chassis black, and shoot the fender wells with undercoating. Or spray the whole underside with the body color i intend to paint the rest of the car. I guess i can decide that when the big day comes to paint the underside. I still have to bend up some fuel and brake lines to run alongside the subframe connectors while its all in primer.