Finally the decision has been made.

dartfreak75 said

Yea i knew that 318/340 dampeners and 360 dampers didnt interchange. I just didnt know if 360 dampers would interchange between engines

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What I am trying to say is that the 340 cast crank damper IS an imbalanced one, similar to the 360 LA but is NOT the same imbalanced one as the 360 LA. So don't get the cast crank 340 damper.