That's the ejector area, and nope- you can't epoxy bed that area at all. If you're referring to the area next to the ejector behind the mag, that's where the screw is that holds the sear- so no there, as well. Grind it all out. The left side of the receiver forward of the ejector beside the mag opening could be re-done to mirror the right side- which looks great.
Tang area looks good.
Most important, IMO, is good bedding around the recoil block. Just like the recoil lug on a modern bolt gun, tight bedding around this is essential for accuracy.
It should be done with two pieces (for thickness) of blue painter's tape across the front and sides of the block, and of course none on the rear face. The tape provides minimal clearance for being able to get the action in and out of the stock when required.
Forget about getting a correct cheekweld with the military stock, they were designed for iron sights and the sharp drop of the comb reflects that.
I've always been amazed at the effectiveness of the snipers using the PE type scopes...you know that their cheeks never touched the stocks (chins, maybe...)
You can try one of these, I have a couple of them and it's easy to pack some additional "stuff" underneath the get additional height. Pretty well made, and the price is right...
http://www.midwayusa.com/product/756...ck-nylon-black