Well, if it was mine.
First I’d have the heads flowed to see where they are at. Then if the heads were in sad shape, I’d have a four or five angle done on the seats, and flow and port accordingly. I’d leave them at 84cc. I would definitely put that TW67G in; as that 59G may need more compression than you now have, and is more of a top-end cam.
OR, if you just want more torque, leave that cam in and raise your compression.
Hope this is food for thought.