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If you push in on the left one the right one should pop out. The spacer around the pin in the center will transfer the movement of the left axle moving in to make the right side break the stuck foam seals.

Seems like it was run with water/coolant in fluid. Should not be emulsified (pink Pepto bizmo). Simple water intrusion would remain separate from oil. If run with water it is now in converter and will need to be addressed.

Your 340 should be forged crank and internal balance, no weight on converter. The 72-73 340 has cast crank (converter has weight on it) it does not have same external weight as 360.

The flexplate should not make a difference unless it is a offset balance aftermarket one (looks very different from stock)