Oh crap, I knew that! Brain fade....
The Yamaha V6 was in the SHO Taurus.
I never could understand why they put that 4 cylinder in a big car like the T-Bird. Why not a turbo-d V8? That 4 woulda probably worked better in a Mustang, or other small car.
Personally, I'd maybe put the independent rear end in the coupe, but I'd leave the small block in it.