I don't work on truck engines all that often Steve, been a real good while since working on a 7.3 stroke, I can't remember what size those bolts are, but I'd be willing to bet they're metric. Not much room to work in there with the radiator in place, have you considered removing the radiator for more access? I know, just more work. If you can't figure a better way to "hold" engine to remove balancer bolt, might try removing bottom convertor housing cover, I think there's one on the auto trans housing, or removing the starter. Then fit you socket/ratchet to balancer bolt, turn crank (with ratchet) until it's up against truck frame member, then use a pry bar to turn the flywheel using stater ring teeth to unlock front bolt. Just a thought.
