Find a engine builder near you that is familiar with small block Mopars and tell him your story. You need a completely rebuilt motor to achieve your goal and it isn't going to be successful by picking suggestions off an internet forum. I don't know how much HP it takes to get your car to 10.5 but doing it with a 318 is going to take a PLAN from someone who knows what they are doing. I would bet you'd be in for $6-8k in the motor alone.
