I also went with Duplicolor Engine Paint, but couldn't locally find that Chrysler Red. Instead, I ended up going with their 'Chevrolet Red/Orange' color. I suppose that's a little blasphemous to use a Chevy color, but it turned out looking really well, so no big regrets.
The paint on the valve cover started flaking off after about a year, but I admit I didn't prep that as well. I re-painted it (same paint) but then put two coats of Duplicolor Engine Clearcoat over it. Turned out great and is holding up fine.