Yeah Johnson's powder coating in Mt Laurel. I used them for a set of headers a few years back.
You don't need to get the valve covers coated on the inside no, just the outside. The coil plugs, just buy a rebuild kit for $30 if they are OEM ones. Usually just the boot and spring is bad, not the entire coil. Just did them on my Expy like this, works perfect.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.