Not sure this is Required, because
#1 you can't use the slanty trans anyway
#2 whatever TC you use can be carried over to the next trans, so long as you stay with the basic capacity. Or you just use a correctly weighted flex-plate and carry that over to anything.
The only time that you run into a snag is when changing from an auto to a manual trans. But even that is not a really big deal; you just get whatever flywheel you have, balanced to your correctly balanced flex-plate.
