Cerakote seems to be good stuff and cures on the car so no need to stink up the wifes oven. Havent tried it yet but been crawling the sites for info. I am going to use there ceramic coatings on my pistons domes and valve heads.
I have tried every kind of paint from cast blast to the vh stuff with super high temps on the can. But they just flake off when it gets hot.
Use a satin color gloss looks lumpy on cast unless your really good with the paint job. Satin just looks satin even if you blob it on with a box of old glue brushes.
If you want them chrome or gold or some other high gloss color use high temp powder coat. You will have to send them put for the trickier coatings. Gold or chrome will be the most expensive. Matching car or engine color will be the most difficult to get right pick a color that is not directly attched to the manifolds so any color difference will not be so easy to see.