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From what I've heard it's pretty easy to swap in a D16A9 (or Z5).
It bolts right in and since your car has the D16A6 you can keep your tranny and ECU (although it's better to use the ECU from the CRX it came out of).
As far as I know there's hardly (if any) extra wiring.
Ask this question in the 88-91 Civic/CRX forum, lots of people have DOHC swaps there.
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