I'm reading that date a bit differently. I'm seeing it as 4 298 with that second character not as an 'A' but as a triangle which likely was an accidental "place holder". I've seen those triangle characters on other stamped in cast parts from GM cars often placed in the second position.
So 4 298 would simply be the 298th day of 1974, for early 1975 model year production.
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