gestimate hp/torque gain from 40 to 52% od

I have a 12.5:1 468 bbc 14:71 hh delta bottom. I am changing from 40%to 52%od crank rpm 7500-7600 how much hp/torque would this gain if the afr is correct. I make 30 psi at 40od at 6800 crank rpm now on a fat tune. Thanks in advance Craig