Jeff,
I was looking at your rad ID tag, could it be 46 H, not M. The reason I say this is that the de-code for Harrison Rads is the year built is 1946 the month is a letter starting with January as A, Feb as B, etc. So if the letter is an H it would be a build date of Aug 1946. This is my best guess. I live in San Jose. I have a 48 1 Ton Chevrolet Panel. Enjoy your "new" truck.
