I ran a pretty much stock 727 for about 2 years in my cuda running mid 9s at 3800 lbs. It had a manual valve body, deep pan, and a bolt in sprag...that's it. Then the drum exploded and disintegrated the transmission.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax