You should shim only the ones that need to be shimmed. Did you do the correct procedure when installing the rockers? The lifter needs to be setting on the base circle of the cam (valve closed) and after you get to zero lash, then it should torque down between 1/4-3/4 of a turn.
is this the way you did it?
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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