The 1969 Camaro and Firebird extension run to November/December 1969 was not due to a strike, it was because of tooling issues (specifically, the failure by Fisher Body to create the rear 1/4 panel dies for the 1970 model). I think the "strike" reference may be in regards to the Van Nuys plant strike, but that didn't have anything to do with extending the 1969 model year.
Now back to the Corvette LT-1.