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First off, is the first number right? I can't find that in any of my Olds books.
2nd the 411990 intake is a 4 brl from a 1973 350 and the 557265 motor you talk about is in fact a 403. The ID after the block number is a 4A it's a 1977 and if it's a 4B it's either a 1978 or a 1979 motor.
The correct number in 1969 for a Olds 350 motor would be 395558 with the ID number of 2, which is a pretty good motor
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Me 
2000 Alero running 14's
2005 Nissan Altima (her's)
1985 Delta 88 w/1968 350 rocket ( MURDERED ) 
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