Engine decking issue(help)

MoparMark91 said

So im going to do another check juat to check again but my question is if that is true reading then should i get undersized bearings?

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After looking in a 68 Dodge service manual your good to go at .0005-.0020 max .0030 on the rods and .0005-0015 max .0025 on the mains.
This is the spec for your 340 block using a 340 main journal size crank.