I have also figured out today that I am going to have to come up with a flat lid hinge. I bought an 8 x 2 inch pipe to go in the bung hole with a 9 degree elbow on top for my smoke stack. However this is going to make that side of the lid a bit more heavy than the other side so I believe putting a hinge on it is going to be my best bet. I am going to try to modify this style hinge to make it work.
I feel like if I position the hinges with the smoke stack in the middle of it and on the side closest to it it will be the least amount of pressure on it.