[VintageMusclecar]

If I may step in here;

The carburetor was like that when Mike received the carb, and when it arrived to me for restoration.

This is not the first time I have seen this done, and I am very, very confident that this was done when the carburetor was new, and that it was/is not an attempt to alter the date, but more likely a factory repaired mis-stamp. (There are a few other things that I don't wish to disclose on a public forum that also lead me to believe this is a factory stamp) I wouldn't think Holley would have scrapped an otherwise perfect carburetor over a mis-stamp.

FWIW, ever seen a double, or even triple-stamped Holley metering block? I've seen a bunch of them.

I have seen at least a half-dozen other Holley carbs with what I consider to be a "repaired" date from the factory. Some of the other carbs I've had in I am absolutely certain had been like that since day one. An example would be an apparently rather large run of Holley LIST 3418 carbs which were produced in 1970. I have seen numerous examples of that particular carb that had their dates ground off exactly as seen above and re-stamped. It wouldn't make much sense for someone to go to all the trouble to make such an obviously poor attempt at altering a date on an otherwise low-value carburetor.

If I had any questions about the legitimacy of this carb, I would've declined to perform the restoration.

Eric