Why are people trying to use them? Consider the alternatives.....Spend thousands and cut up the car or spend thousands and wait for two years?
I got my A833OD for $100, complete with Slant 6 bellhousing and shifter. It'd bolt right into a car. But you're right, the gear split is too big for performance driving.
It's a no-win situation. All three alternatives are less than perfect.

R.