How much more is it worth?

In mopars, numbers matching means everything. But that block looks beyond reasonable repair cost wise. Not only repair the crack but all critical machined surfaces need to be checked/recut. That includes cam tunnel and lifter bores. I would have it tanked, fogged and bagged then put in the corner. Let some numbers fanatic with deep pockets repair it after you are done with the car and send it down the road.