For what it's worth, I have a 640 intake with a casting date of 8/11/71 - an early '72 production part. I do remember buying a new 640 back in about 1975 or 76 from the local dealership with a friend when he was replacing the intake for his '69 Ram Air IV GTO. He ordered the replacement part and got the 640.
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Dick Winkles
1970 RAIV GTO 4-speed
1974 Original owner Z-28 4-speed
2008 SRT10 Viper Very Orange (was SD TA!)
2015 Challenger Hellcat 6spd (was SD TA!)
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