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I know the 1965-67 400 and 425's used a different flexplate than the 455 but I understand the 1968-69 400 was the same as the 455. Someone else will need to chime in and confirm that. John
All 64-67 flexplates (except, of course, the 394) interchange. All 68-90 flexplates interchange. You just cannot change early with late, since the crank flange bolt pattern is different.