I've used regular acrylic enamel paints on engines with very good results. Remember that most parts of a water cooled engine won't get as hot as the roof of a black car in the dessert.
As far as 56 Clippers go, I use green metallic from those Geo Metros and Trackers of about 10 years ago. That's pretty darn bright, but the little bits of undisturbed color I have seen on old engines were also alarmingly bright. Here's a 56 Super engine I did a couple of years ago.
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