From what I've seen, dip what will fit in a paint can of semi-gloss black, primarily alternator brackets. Long items can be handled with a pain of bent coat hangers to dip one end, remove, hook the painted end and dip again to cover everything. A quart should be enough. If you need something longer, try a short section of PVC pipe large enough in diameter capped at one end. Support it well. I used a Kelly-Moore custom blend semi-gloss black for dipping. I think it was about 40 percent gloss. I needed a gallon for dipping upper "A" arms. For horns, after you make them work, stuff a chunk of foam rubber in the throat, mask the terminal and spray paint semi-gloss black. Do that sloppy so you get a run or two and it sets. The same for the hood latch, brace and bracket. As long as there is a slight difference in gloss between the black components and the engine bay you should not have a problem. The hood latch brace and bracket would be close to the engine compartment. Ford had a range of gloss so multiple vendors could be used. In other words, whatever was cheaper. Different brands of semi-gloss black paint should also give a different appearance.
Jim