This car restoration site called Hirsh Automotive has Engine Paint. Dont know if it is the exact color you want but they have it in Brush Paint and Spray Paint.
http://www.hirschauto.com/departments.asp?dept=2
http://www.hirschauto.com/prodinfo.asp?number=EEA%2DSPRAY


250 Integrated Head / 1981 C-10 Pick up.