maybe someone can help ? when did they stop using the #3788421 bellhousing with the 4 3/16" hole which they call the first design . which to my understanding uses a small imput bearing retainer cover ? my car is serail # 12921 is the # 3858403 bellhousing correct with a muncie and a 4 5/8" imput bearing retainer cover correct ? this all is about 63 corvette only ...thanks rick
3788421 bellhousings
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