Been working on this on the truck side:
http://67-72chevytrucks.com/vboard/s...49#post8533449
Don't know the definitive answer...but it's likely "some did". Here are two relatively honest looking 69 Blazers, a 307 and a 350. The 307 was very late in the model year. Sold new in August of 69. Built in St. Louis. I have a suspicion that the burgundy one was built in St. Louis too. Neither have a heat stove air cleaner assembly.