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I have only read post on the swap and you will need to change your computer but to what I have no clue. It's no a straight forward swap, drive shafts will also be different lengths.
Which engine?? You'll need a transmission crossmember too from an early 80s truck with a C4 and a kickdown cable from the same engine as the computer and harness too.
Yeah the C4 will work with a 5.0 but not a 5.8. See if you can find the crossmember out of a 80-84 truck of the same model as yours (i.e. F-150). Quick question though, why would you want to lose your overdrive?