1966 Chevelle SS396 Convertible
The Engine was a warranty replacement at some point, not necessarily this vehicle. However, the stamp in the starter mount shows "T090" indicating it was installed on the 9th month of 1970 (most likely under warranty replacement plan) from the Tonwanda Engine Plant, which was in Buffalo, NY. In 1970, GM marketed this engine as a 396 or as a Turbo-Jet 400.The warranty was three years or 36k miles what ever came first. So a 70 casted block can’t be under warranty
With all that said, I have yet to find the VIN stamp on the block to verify or dispell the engine was installed in this car.
Knowing my (deceased) father-in-law I'm surprised it's even remotely close. So to find the engine is only 4 years newer than the body, blew me away. If I have any of the above information incorrect, please let me know.