Slant 225 motor codes from VIN and trans mating questions

After about 69-70, they came out with a 727 version that was made for the 6. Bolts directly to the engine. Up til then any slant 6 that had a 727 had to use a small block trans, and as everyone knows, a v8 trans won't bolt to the/6. That's when they used an adapter to put a 727 behind the slant 6.
But, people who are looking for an overdrive trans for a slant 6, and don't want to have to shift their own gears, sometimes look for the adapter that 68Barracuda was talking about, as they never put an overdrive automatic behind the slant 6 from the factory. I'd actually be interested in one of those adapters if I could come across any.