I’m working on my ’83 Jeep CJ7 engine…installing a 4.0 liter head. I’m going to paint the engine with your AMC blue engine paint and want to paint an aluminum valve cover to match. My problem is that nobody sells a “plain” aluminum valve cover. The ones I like are powdercoated already…in red, black, and yellow. Can I remove the coating? Or do I need to scuff it up and paint over it? What type of prep would I need to do?