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The original question was: will a '74 bell housing fit a '63 A-body trans and clutch linkage. The answer is no. Now you can MAKE it fit if you want to modify stuff but it's not a straight bolt-in. This photo will show the main differences through the years. From left to right....'62-4, '65-6, '67-74, and '75-80. The last two look the same on the linkage mount but the transmission bearing retainer diameter is different.
Thanks, Mark