They were made by Tremec and were based off of the 3.03 Ford/Tremec 3-speed but with a different input and tailshaft. I don't know what the relationship was between Ford and Tremec, but the Ford Toploader was also made by Tremec. Here is another version used in '66-9 GM BOP A bodies. 3.03 is the...
Those older 8-3/4 have the ratio stamped on the bottom. If it is a Sure Grip, an "S" is also stamped. I can't find anything about this anywhere. I should have taken a few pictures of the example that I had. I'm thinking it was a rear out of a '62 Savoy with a 741 case 3.23 Sure Grip so they were...
It has a flat plate carrier and looks like a 10.95" disc that is used with a 130-tooth flywheel with the scalloped pressure plate but will work with a true 11" pressure plate with no issues. I have a similar one and you can see that there is no marcel.
This has a chance of having the 3.09/1.92/1.40/1 gearset since it could have been for an early '74 model year car based on the date and would also have the 904 26 spline output.