The Ultra bell has a few issues you might or might not be able to live with. First, I believe it is limited in the size of torque converter it can hold; it is smaller internally than a stock bell.

Second, it attaches to the trans via the pump bolts. These bolts are small (5/16" diameter), long, and were never intended to anything but attach the pump to the case. If you look at the case itself, several of the threaded bosses are very minimal - there's not much meat around them.
As a minimum, I would HeliCoil all of the holes to get steel threads. I'd be surprised if you could get 50,000 miles in a street driven application without some sort of pump related problem (like leaks) or even a case/bell separation issue.

Also, as a race piece, I do not believe it offers all of the factory bosses. So if you have a column shifter or kickdown linkage you might be forced to rework your linkage which is seldom pretty.