There are numerous January of 70 dates that were produced by GM including 012 , 013 and 014 . Not much as Rick stated after that besides the 035 on 4557's.
The bulk of 4557 production appears to have been prior to Jan of 70 Just like the distributors. A bunch were produced for production early on so it's not uncommon to see an LS6 with a fairly early dated carb or distributor.
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