[427king]

That car would most certainly be a 854 block. I find it hard to believe that while there were 291 heads cast in early June of 1969,that they would never have been used on cars built in the same model year and 4 months later.I know of several original 69 camaros that had one 291 and one 840 from the factory.So the possibility there were cars with 291s on both sides is more than probable in my opinion.And since 840 production ended in the first days of June 69,they could have run out of them by the end of that strike year,with some 69 camaro L78s being made in Oct 69 or 4 months later . I believe the reason 291s were made in June 69, and then not again until september 69 tells me they made those to make up for the lack of 840s to get them thru production. In non strike years June dated heads would last until the end of that years production,but 69 lasted alot longer and i believe GM casted the June 69 heads to cover than extended production.