Any Tips On The Zc Swap for 88-91 Civics?

Do you know of any defaults or problems you will run into when swaping from the Stock motor of a 91 civic to the ZC. And if there is, can you please let others know. Also, if you have a dx, and swap a ZC, into it ... do I have to replace the computer for a Si computer? thnx alot ... happy racing

-peaCe*