There was a turbo four-cylinder in '83 but it was not an SVO. It was a Turbo GT/Turbo RS (Capri).
Turbo RS = '79-'84
Turbo GT = '83-'84
SVO = '84-'86
If you have the Tag ID # then you also have the Ford engineering #, BW serial #, and build date. Post all of the codes from the tag.
If it's Ford Motorsport SVO transmission, it'll have an engineering number reflecting such. I bet it doesn't. For a couple of reasons....1) the tag ID # is too low for a Motorsport SVO transmission AND 2) Motorsport SVO didn't sell the "Z" spec transmissions in '83.
The'83/'84 turbo four-cylinder T5 transmissions also had a first gear ratio much higher than the "Z" V8 T5. (4.03 versus 2.95) Hard to mistake one for the other.