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The difference between versions of the 2.3 are mostly related to fuel pump, oil pump and ignition/distributor. The 2.3 and 2.5 share the same block, the different displacement being done by lengthening the stroke. The 2.0 has a smaller bore. There IS a difference somewhere in time with the crankshaft journals.
There is at least one post here that details ALL the differences...
tom