I'm using Boomslang's obd-0/1 conversion harness (which has a integrated harness for VTEC and everything totally included, but Rywire's is great, too. It's the same thing. Just see which one's cheapest!
You will also need an OBD-0/1 distributor harness (or make one like in my signiture, OR just repin the connectors). You have to use an OBD-1 distributor. Hopefully your Z6 you just bought has one on it. If not, just find a Z6 dizzy.
The trans will bolt right up. If you can afford it, get a new clutch. (I'd recommend Advanced Auto's. They have lifetime warrantys, meaning when it wears out, get a brand new one- free!) Use all your same setup with the axles and stuff.. everything will go together fine.
Oh, and use the mounts from the A6 though. the EG's used a different mounts than EF's.