1971 Swinger Build \6-V8 Swap

Fighting currently driveshaft lengths, own one 52 ⅜" and 2 other longer 7¼ drive shafts. One is short and other 2 are too long. Short one when installed makes a clicking type noise before park gear attemps to engage. Did I do something wrong? Missing something? Sticks out of the 904 tail cone more then original marking show.

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