From what was on my '70 Monaco Brougham, 383 "N" code, dual snorkle, factory crinkle, it appears the crinkle flattens and dulls with age. That's the way mine was. I bought the car in May, 1975 so it was "a used car" at that time and unmolested. When I found another air cleaner and put some rattle-can VHT crinkle paint on it, it was a much deeper crinkle . . . after I figured out how to spray the paint to come out correctly. When sprayed, as the paint drys, THAT's when the crinkle happens. I let mine air dry, but some guys reputedly baked them in their wife's oven -- YIKES.
It took me a time or two to get the hang of spraying the crinkle and getting it to the right texture and thickness. In the air cleaner I was repainting, there was even a factory run in the orig crinkle paint!
The BEST match for normal air cleaner paint (and other black underhood engine items, plus the solid a/c lines) is GM black "gloss black engine enamel". It not "glossy gloss", but a satin gloss, but not nearly as satiny as normal satin paint. Spray on or use artist brush for the a/c lines, but it matches the Chrysler factory underhood black perfectly. Unlike the softer satin paints, it dries hard and acts like a "hard paint", not absorbing fingertip oil and such.
There might have been some Chry air cleaners which were glossier black, but it seems like they were more middle-later 1970s and on A-block motors? But stilll not "show car gloss black".
Just my experiences. Yours' might differ.
Enjoy!
CBODY67