Definitely is ZL1 with the cast # and seeing extra head bolt boss on block. Winters snowflake may not be winters though. Check and see if it has a W in the center of snowflake. Most Yenko blocks had SYC stamped small in timing cover area or a large Yenko crest in front of block. Also some Yenko blocks I believe had other part number 053.
Looks like a nice haul...congrats!! Some were tall blocks also.
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