Well I want to stick with an automatic transmission, so Rumble I suppose that A-500 would be the one for me. Was it ever built to bolt up to a Slant 6? I thought (coulda sworn) I had seen AOD /6 cars before....
To use an A-500, you will have to fabricate a crossmember and likely do some cutting/rebuilding of the transmission tunnel. Not to mention finding the (rare) bellhousing adapter to convert to the V-8 bolt pattern and getting your driveshaft shortened. This is not an easy, "bolt-in" conversion.
