You might be on to something there 80. On a side note, I tried selling my 84 Mustang GT Turbo convertible which is rarer than this T-type. 2,238 T-types were made 1,163 were WH-1, 731 Turbo GT convertibles were made 412 when you take away anniversary cars and mine is one of one on color. I was asking $7000.00 and didn't even get an inquiry. And before anyone says anything I know - It's a Ford !
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I would buy your Mustang For $7K before paying $10K for that '84. There is a price I would buy an '84, for...and that is low enough to put a built Turbo LS/4L80 in in it and still be under $20K total.
Then the joke would no longer be on me.
A friend did this with a 2001 Z06 (put a TT lingenfelter motor in) because of the verbal abuse from the "405 HP" LS6 DB's.