GM carb on my 400

Michaeluser,
Ferrari did use the TH 400 in the 400 SuperAmerica. My brother worked at a Ferrari shop for years and he is an expert on them. And he converted a few of them to sticks.
The TH400 was a great tranny but the lack of low end torque of the V12 and only 3 speeds with no overdrive and a heavy car made for a combo similar to a 4 cyl. Iron Duke engine mated to a Powerslide in an Impala equipped with a 2.76 rear end.

http://en.wikipedia.org/wiki/Ferrari_400