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The date code appears to be for 66, the tag for the st300 2 speed transmission will be on the passenger's side of the transmission, what are the codes stamped on the front passenger's side of the block just under the head? It appears that your engine date code and your car's build date (01D- 4th week of January) match,
 

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Super Moderator
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The YE code is what I was looking for, unfortunately that is the engine code for a b-body and not the GTO,

1966, 389, 325 HP, YE, Automatic, 10.5cr, 066 cam, 092 heads, 1-4bbl, 4034S carb # and Block Casting # 9778789
 
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