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Craig,
I think you should be OK on the engine, as Rhaire has mentioned, you basically want to use the B23 bottom end and the B21 head with B23/230 gasket. Should work fine.
The transmission might give you some headadches though. You can check this thread about my desire to swap the BW55 for AW71: http://www.brickboard.com/RWD/index.htm?id=445624
I'm sure that it's doable, but my mechanic saw too many problems with the swap on the '78 to make it feasable... frame rail differences mostly, I think he MUST have measured wrong for some other issues like the drive shaft, and shifter though, but the frame rails definitely narrow earlier on the '78 as opposed to the early/mid '80's turbo's. Unfortunately, I didn't have the time to attempt this myself, or I might be able to give you more useful input. I just had him put in a refurbed AW55... Still buzzy as hell on the freway, but it works.
If you attempt the AW71 swap you will need at least:
the drive shaft from the AW71 donor.
the transmission crossmember from the aw71 donor.
the OD wiring harness/relay from the AW71 donor.
Some drilling into the frame and possibly the floor, etc. will be required!
--steve
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