For myself I use the rust-o-leum gloss black in the rattle can. What happens is when it is first painted is will be glossy, then in about a month it loses it gloss and it begins to look like the factory. I use it on all the cars I do. Why it does that I don,t know, but it works.
I got into this a couple of years ago and per my interpretation of the Donahue book I used gloss raven black on fire wall and rad. support, and then mixed a "flattening agent" into the same paint to paint the inner fenders to the " correct ? '' % of gloss/ flat. Was able to give it a good heavy coat and after 2-3 yrs it still looks good. It's as smooth as a high gloss but looks flat. It cleans up well. Oil and finger prints wipe right off. I painted the fan, power steer pump, steering gear box, master cyl. and steer cylinder with the "flat " and the engine with gloss engine paint. If I ever get the valve covers and breather painted gold it should look good.
Good luck with your project.