Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The POP will have the engine assembly number on it, but that doesn't prove the block or components are original. Carbs, distributors, intakes, transmissions, rearends, blocks, and cyl heads were often swapped out in the '70's. I can remember '71 casting 96's being a very popular D port head to swap on '67-70 GTO's and Firebirds when I was barely old enough to drive.
As collectible Pontiacs were found and restored over the last 30 years, many cars regained "correct date window" correct casting parts. Have had a lot of big valve high compression Pontiac heads go through my hands since the late '80's and most were bought or traded for to replace missing or cracked or heavily rusted original dated heads, not to go on local race cars or for upping compression ratio on 71+ lowr compression Pontiacs. That said, an original POP and truly original paperwork handed to you by the original owner, are as good as it gets. I would be aware that POP's were imprinted at the original dealership, and over the years, several of us have ran across numerous individuals that had certain year blank POP's and even a few had POP imprinters, and yes a few were using them to make new POP's. With the right type set, even correct dealer addressed POP's can be reproduced, and such occurences have been very well known in the BBC Chevelle, Camaro, and Vette hobby for decades.