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I think you can check the CR before you take it apart.
Set a cylinder at TDC on a firing stroke w the motor on a motor stand and tilted so you can see how much ATF it takes to fill the combustion chamber to the bottom of the spark plug hole. Then use the quantity against the size of your motor to compute the CR.
If there was a lot of head work they may have fly cut more material from the heads than usual. You may want to check the piston to head clearance by putting a pice of soldier on a piston and run in through a cycle before you start taking out base gaskets.
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