This won't help you a bit, but I found some old kindergarten art program at a yard sale and it had an airbrush option. So here is one for a laugh, nothing like the real dual action badger, but way less messy. Hope you enjoy...
could the grill teeth be bent up out of exhaust tubing and then chromed? i think chrome grills are better for tradional looks as opposed to painted grills which look sort of modern.
here's a quick and dirty version i made using paint..added some '54 chevy teeth,nosed it,dropped it and chopped it a bit.a little sloppy? ~creepy