1970 Plymouth valiant a833 tranny?

DDodger said

"Fit" might be a word. I don't think ADAPTING a long shaft into an A is exactly "fit." It's not a bolt in. Some trans won't "fit" because of the retainer diameter. So you have to play

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It is as much of a bolt in as a short tailshaft with the exception of a few hours to fab the shifter bracket.....the drawings are floating around the net, plus they are more abundant, and if he presently has a 727 he will not require a new driveshaft.......

It really depends on budget, what parts are at hand or available locally and the OP's wants.....