Good luck with it! Yes, as was mentioned, get that engine compartment completely degreased and don't forget to use that wax and grease remover on the car too. I painted my old 'cuda with off-white, single-stage.......first I shot the roof, then came back the did the rest of the car, the lower section. There was noticeable differences in the shade. I won't be doing that again.
I was just curious.....if you're going single-stage and thinking about doing a clearcoat, why not just do a 2-stage?