I don't have a listing (at least to hand) with that particular number, but it appears to be an 1100 Engine, but well before the Unleaded Sets were fitted.
<Edit: I'm thinking that it was for an ADO16 - the 1100 series of cars. Basically the same as a Mini Engine, except for the Engine Plate, but that's pretty straight forward to swap. >
I would agree with your information.
I would add that if this engine was bought with a gearbox fitted to check the ratios before fitting it in your Mini as the Austin 1100 / 1300 final drives where very very low and you will not be able to get it past 70..