Hirsh's green looks a lot closer to the orig color of my 64 Belvedere's 383. I tried Duplicolor Chrysler green & its too blue. (you can see the thermostat cover I sprayed with it doesn't match.)
Tried VHT early Chrysler blue & no close match there. Think I'll give Frank Badalson a call as his paints seem to be good matches. Could have my valve cover scanned & paint matched locally, but a can of mixed spray paint is about $70.