That TCS website is all to hell and only half working. Their old website was great.
I wouldn't bother with the bolt in sprag. When they fail it is not usually because they have come loose.
I would fit a billet steel or aluminium direct clutch drum. That way if the sprag does fail the trans will not explode. The stock cast drum can spin at 2.2 times input rpm if the sprag fails and most trans explosions are caused by a stock drum flying apart.
The aluminium version is cool and about 57% lighter than the stock drum. Plus it will hold up to 6 friction plates vs. 4 in a stock unit.
A manual valve body will prevent sprag failure anyway if it applies the rear band in low.
It is vital that you buy this book before you start;
http://www.amazon.com/Torqueflite-727-T ... 735&sr=1-1
You should get a catalogue from TCS and have a look.