My first thought was 50's Hudson but the except for the headlight eyebrow and the square mirror. The Baby Bird would also have a round mirror. No sure what year they started with the square outside mirrors.
Lately I have been using MCW lacquers. They work well in the airbrush, no reducing needed, dry fast, run resistant and have a great choice of colors. First paint I have found with a Clear Primer
Look at the "files" on this FB page https://www.facebook.com/groups/901280716708640/?hoisted_section_header_type=recently_seen&multi_permalinks=1239680576201984