Join Date: Oct 2004
Location: Deliverance, GA
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Welcome to the forum,
Pontiac used some of the same casting numbers and letter codes for both 65 and 66,
If you find a 66 engine with the correct letter code and date code the car would be date code correct and there is no way to verify if that is the correct engine or not.
Pontiac didn't start recording engines until early 67 when they documented the engine unit number on the build sheet, in mid 67 they added the car's vin number to the front of the block.
What are the numbers on the block, intake and exhaust? Have you ordered a PHS packet to see which engine the car was born with?