Great, would love to see it.
Please re-read my comments about inkstamps and codes on sealed beams; I addressed all of this. It is not the case that there "should be three digits" at the top of the lamp. Sometimes there are, and sometimes there aren't, and sometimes there's something else.
Already answered this, too.
Be very, very, very careful writing a reference book. It's a much bigger job than it seems. It is extremely easy to include guesses and assumptions and received wisdom and observations from looking at one or two or three cars as "facts", and it is extremely difficult to verify a great many details such as the brand of headlamp originally installed.
"How it was from the factory" depends on which factory built it, on what date, for what market (cars built for Canada got different equipment than cars built for the US, which got different equipment than cars built for export to Sweden, which got different equipment than cars built for export to France, etc.). How it was from the factory also depends on random chance. When 273-2bbls were being assembled, whichever carburetor happened to be in stock and next in line got useda Carter BBD or a Stromburg WW3. Same with 225s; they'd get a Holley 1920 or a Carter BBS. Ignition coils, too, came from a few different suppliers. Same with headlamps. And those guys who spend ridiculous sums of money to get a custom-made crayon with exactly the shade of orange (or whatever) they think is "correct" for the slash mark on their rear axle? They're delusional. There was no "correct" color for that crayon. It was whatever the rear axle inspector had in his hand. They weren't about to stop the line because he used up a crayon and another one of exactly the same shade wasn't available.
Was it built for export, or for the US market?
