The cost difference will depend upon how much wear there is on the original motor. At 220K miles I would anticipate the crank and block to require machining to bring everything back to factory tolerances. That would like mean griding the crank journals, boring the cylinders requiring over-sized pistons/rings and oversized crank bearings to match. I would also expect the heads would need fairly extensive work (guides, all new valves, valve seats and springs). The cams and cam followers etc will need to be carefully checked for wear too. That covers the motor...then you will need to check the turbos. You may need to have the bearings and seals replaced.
Whatever your decision is I wish the best of luck.