This:
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So you get a new shaft with the flange shown to take the place of the ball and trunnion u-joint. This is the easiest but costs the most. You might can find a vendor to sell you a new joint, but it won't be cheap. Is your Valiant an automatic or stick? If it's a stick maybe a swap to a later slip joint transmission, if automatic and you want to keep the buttons, you don't have much choice.