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Thanks Allan, Orr Automobiles also other area Chevy Dealers sold a lot of performance cars, not just Central Chev London as most think of today.
Do you happen to know if Orr used more than one Dealer Code for their Kitchener and Waterloo locations, 85-761 likely what your GM info notes?
Whether you or whoever the next lucky owner may be can track down the original engine, the VIN may be best shared here in case the Block ever surfaces and anyone Googling the #’s finds this thread.
Here’s a few 68’ish Orr Newspaper Ads, shoot me a PM if you want any more.
Best of luck w/ the sale!

~ Pete
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