i would use dbc deltron base/clear.
its a ppg product. i have great success with this system. for base i d use dbc. and for clear i d use 2042, or 2021. these clears are very forgiving. if you get a run it is very easy to block out. very nice shine. the base is very simple to spray also. i would definately use guidecoat after primer. you can just mist the primed areas with guide coat black or use trim black. it will help you find any low spots. good luck