I like the eastwoods engine paint with hardener added. A cheap harbor freight paint gun and $50 in paint/hardener and you have a nice finish that immune to solvents/stains from fuel leaks, coolant leaks, oil leaks, etc.

Can't vouch for originality. I wasn't around when these were new, and every car you see at a show looks slightly different. You'd likely need to do a side by side of a good quality survivor to tell