Va Longbeard,
I sent you a PM with no response, so here is my reply.
You have selected a Great Turkey gun. I have the same gun and have rigged my gun out just as you have suggested. I shoot Hevi-13 3 1/2", 2 1/4 oz #7s through a .670 Pure Gold choke and put 300 plus in 10 at 40 yards. I have put a Limbsaver recoil pad on it and added about 4 ozs of lead shot just ahead of the limbsaver with a piece of styrofoam to fill up the hollow stock. I'm not sure if the extra weight lessens the recoil but it does help to balance the gun. I also added a comb raising kit and a Bushnell Red Dot scope to finish it off. With the added limbsaver, extra weight and comb raising kit, the recoil of my 835 with the 3 1/2" Hevi's is like shooting a 20 guage with dove loads. Good Luck Rigging out your New Turkey Slayer.
By the way, where are you from? I grew up in Southwest Va in Chilhowie but now call Eastern NC home.