454 swap problems

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    1988 5.7 to 1995 7.4 swap question

    Hello. New guy here. Have done a search but could not find a specific answer to a question. I picked up a 1988 R2500 3/4 suburban 4x4 and somewhere along the line the 5.7 In it was swapped with a 1995 7.4L. It’s running super rough and was wondering in doing a swap like this would any of the...

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