According to Steve Wilkinson, the Ricardo transaxle not only weighs some 50 lbs more than a ZF, it is too wide to fit between Pantera frame rails. The one they managed to install (Ford GT engine & trans in a Pantera) required extensive frame cutting and repositioning of the lower a-arm mountings, which then altered the geometry of the rear suspension.
FWIW, Jr Wilson had no trouble in 10 years of competition with a ZF behind his Silver State racer running a 900 bhp 574-inch Boss 429. But Jr shifts easy; its possible to break anything with shock-loads. Greg Esakoff has broken at least four ZFs (usually, 2nd or 3rd gear) with a 750-bhp stroker in his roadracer 'cause he slam-shifts the poor thing. Same thing goes for u-joints vs. CV joints. CVs are less easy to regularly inspect & grease than u-joints, and do break behind factory Porsche turbos.
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