AMC Engine bays were painted the same colour as the body. It's important though to remember that hood closure support is painted trim black where it's visible behind the grille as are all other bolt on sheet metal components such as other grille parts, battery tray, rad and shock tower housings and the heater controls body but not the faceplate. The brake fluid reservoir was bare metal and ended up coated in rust in most cases because paint cannot stand up to spilt brake fluid.