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not sure if there is much difference between a 70 and 73... most of the differences have more to do with which inputs/outputs they have. The former is determined by which tranny is in front of it. Later depends on year...
The only difference that I know of between 1970 and 1973 is the 350/205 versions where the adapter has an extra support bearing in it. GM did away with it after 1972.
IMO the early 350 adapters were better with that extra bearing,I would think that the splines would get less wear.Have you ever grabbed an auto tranny output shaft,not real rigid.
It's a shame that the "bean counters" make the engineer's do away with what is not absolutely needed as the years go by. Just another example of how they don't make em like they use to........