Looking for old fashion enamel

Presently working on my 73 Dart body. This is a driver, NOT a show car. I am trying to get good old enamel I can spray with my N.O.S. Devilbiss spray gun. Up here in ‘save the world’ Canada I cannot get custom mixed enamel. So, wondering if anyone can recommend any northern Midwest suppliers, Michigan, Ohio, Indiana, Pennsylvania that I can order a gallon or so of custom mixed enamel? Years ago when in Richmond, Indiana I noticed the O’Reilly’s there had a big shelf full of paints, a lot more than Michigan. Maybe stricter regulations in Michigan? Any suggestions much appreciated.

Thanks, /six.