Hey Jake,
First stop will be to get yourself a service manual for the IIA. That will give you a better handle on the specs and what you should expect to find. If the standard gearstick and the red and yellow knobs are all where they should be, it could well be a standard transmission. I know that Hemi adaptors to standard trannies exist.
Maybe just have a look at various photos on the internet to show you what you might expect to see. Try google images with "Land Rover Series IIA gearbox" as a search.
Cheers,
John
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