This will incentive Congress to delegate more than they do now. Instead of line items for each major expense in a budget bill, they'll just assign X billions of dollars to Y agency to parcel out as the agency director wishes.

Yes and that will reduce pork by no longer mandating the Army to buy a specific number of tanks that are built in an important Congressman’s district when they really need money to fix a barracks.

You'd hope so, but this will probably be covered by only appointing people willing to delve out pork as directors of the agencies.