Flexplate orientation/Transmission to engine mounting?

Dana67Dart said

Yes BUT what I said still holds. I think it was late 60s early 70s but don't quote me

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That is only a problem on the 273 engines. The register is smaller on the 273 crank, and the corresponding torque converter about is smaller. And the trans for the 273 has a different spline count on the input shaft than the later 318/340/360