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It is true that some of the 302 blocks had 289 internals. Most I have seen were in the May-June block dates. They had 289 Heads if a complete original assembly.
Our CS has a 289 with a #'s matching 302 block with a build date of March 18. It was my understanding aswell that Ford completed 289 orders with 302 blocks once the supply of 289 blocks were exhausted. I think that 289 engines with the 302 block were the only 289's with the serial number stamped into the block.
Our 7-12-68 fastback is a C code 289 with a VIN stamped 302 block. Ford was good at cleaning house of all the 289 parts. I did not know so many E codes were used in the Cougars. Marty