Trying to figure out what this is it came out of my 64 barracuda 318 4 speed

LO23M8B said

Can you switch the ball and trunnion to a slip joint? ps if you run the 340 go with the 10.5 clutch.

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No need. If your B&T front universal is in good shape it'll handle just about anything you can dishnoit. They used that set up in the 426 Max Wedge. 425hp factory rated.