Two types available from Chrysler.
A low stall, approximately 2000 stall and a High stall. approximately 2300-2400.
These converters fit ALL 225, 318 engines from 1968 on.
In 1978, Chrysler went to a lockup style converter.
Again, from the factory, Chrysler put a decal on the pump (hub side) of the converter. One was a tri-angular decal that said LO STALL, the other was kind of egg shaped and said HIGH STALL. Too the best of my knowledge, if decal is missing, there is no way(short of cutting it open) to tell which one it is. If it's a rebuilt converter and you know who the rebuilding company was, there should be their part number on it, and by contacting them, they will be able to tell you.
I don't know if the 1969 converter is a rebuilt unit or a used one, but if it's used, it might not be a good choice. My reasoning for saying that is, a converter is a sealed unit, and unless you get it cut open you really don't know what it's really like. Buy a rebuilt unit from a reputable company.
JMHO