How much do you need ?

[Dino11]

You have enough scope to barrel clearance, but the real question is how is your eye relief to scope, do you feel comfortable and not searching for a sight picture resting your cheek on the stock. This is what will dictate how high a scope mount you need. As long as your scope is not actually resting on the barrel, and it looks like in your picture you have more than enough room. Barrel harmonics at the chamber end of the barrel are nearly zero. Your picture looks like you have more than 1/32 scope clearance at the scope bell.