The casting number 3973456N is the same as my 70 Z28 dated B190, but there could have been various machining specs to the same casting number depending on application. I believe this same flywheel was used on big blocks (internally balanced) and was 11" diam and the "N" indicated Nodular iron. Also the crank flange image looks to be 350, but not sure if this was the original or a later swap indicator.
Not definitive exactly the application for your flywheel, but I would think '69 SBs that came with an 11" flywheel or BBC.
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Steve Nuwer
1970 Z28, Norwood 03A, 48 48, 723 Int, M20, COO, 2021 Legends Platinum restored
1970 L78, Norwood 04C, 17 17, 711 Int, M21, COO, born-with drivetrain project.
1972 Z28, Norwood 11C project, born-with drivetrain, 26 26, 775, M20, CGG project
1970 Z28, Norwood 05C, 48 G, 720 Int, M21, COZ, Original Unrestored (SOLD)
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