I went to Bumper to Bumper auto parts, and they did a paint analysis of the phantom black and gave me a perfect match.
The color match was free, but the paint was about $45. a pint.
I believe the engine is powder coated (I could be wrong) and that makes color matching kind of a pain. You may want to look at a 1238 gray and do a test area to see how well it matches.
Aztec Gold which is IVC paint code L4163, Triumph touch-up part number T3120300-GG or Heritage Gold which is DUPONT BEC 1889, Triumph touch-up part number T3120300-GC