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 #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.