I went to great lengths to figure out the correct color for '52-'53 F-100 engines. They were indeed green. The Krylon Ford Green is incorrect. I'll have to doublecheck the Hirsch paint. I have a can of it but haven't opened it for a while. I seem to recall it isn't quite right either. I got a paint chip from a fellow board member who had scanned an inspection cover with original paint at his local paint shop. It was nearly a perfect match to a bellhousing I had off a '53. I took the paint chip to my local Lowes and had them mix up some Valspar oil based industrial enamel. Check out
my paint saga page. Send me your address and I'll mail you a paint chip if you want to have some mixed up.
Good luck!