Just for my own info, is this correct?
In 1969 Rochester changed their numbering system on quadrajets. Previous years had circle tags 1967, 1968s were all dated on the baseplate. 1969 they tried 4 different ways. 1st was the dated baseplate, 2nd was leaving off the 70 prefix and stamp number and date on one line, 3rd they decided to put the 70 back in the oem and change the font to a smaller size and again put it on one line. They finally settled for the entire number on one line and the date below. This was the way Rochester quadrajets worked. carter quads were different.
In 1969 Rochester changed their numbering system on quadrajets. Previous years had circle tags 1967, 1968s were all dated on the baseplate. 1969 they tried 4 different ways. 1st was the dated baseplate, 2nd was leaving off the 70 prefix and stamp number and date on one line, 3rd they decided to put the 70 back in the oem and change the font to a smaller size and again put it on one line. They finally settled for the entire number on one line and the date below. This was the way Rochester quadrajets worked. carter quads were different.