My Dart Swinger Project!

Ok got the steering column took apart got the shaft extended for the manual box, got the floor pans primed and the back half of the under carriage primered my paint gun doesn't spray very good upside down so it's not covered the best. But it's not bare anymore. I'm thinking about leaving the underside the red primer. Idk yet what do yall think paint it black or leave it red? The body color is burnt orange so the red may look similar to the body color if you happen to glance under lol