I used about the same on my S13. Two coats of gray primer, 5-6 light coats of low gloss black, both in Duplicolor's 500 degree engine paint.
I had the engine out (obviously), fenders and bumper off. I draped a drop cloth over the windshield, doors, mirrors, etc. I pressure washed the engine bay, degreased it with Simple Green and a toothbrush (no, I'm not kidding), then hit the whole thing with a wire wheel and fine-grit sandpaper. I wasn't going for a show finish, just something more attractive than the nasty stock champagne color.
It's held up decently well for a few years, and it's easy to touch up