Do you want to slow your car down by doing this? Or do you want to make the 727 trans. safer?
This LBA valve body discussion was on this forum several years back and everyone who switch to a 727 LBA from a non LBA valve body slowed down at least .03 up to .10 ET
I think the key to making the trans safer is replacing the stock cast iron front drum with either a billet aluminum, steel or billet aluminum drum with a steel sleeve where the band applies