I'm selling my 93. The guy looking at it has a 96. I know most of the differences, but I don't understand a few.

Would it be easier to swap the whole motor with the computer, or can he swap in just the block and heads?

So far it just looks like a mess and a headache, so I told him he should keep looking.

 

Is he looking to swap your 93 engine into his 96? If so, just swap in the block and heads and bolt everything else from the 96 on. He'll need to swap the front of the engine as well...timing chain and gears, long pin into the cam to drive the newer opti, the 96 timing cover because of the cps. The knock sensor will need to be swapped out as well. It's not hard to do this swap...