turbo charging

i am taking out the 390 out of my f250 and putting in a 330xd ft motor and allison at540 trans back in i am not going to rebuild my 390 because it is going to cost 2000.00 i think 2000.00 is to much money for 255 hp and 372 ft lbs of torque anyway i want to put on twin turbos for more power i do a lot of heavy towing and hauling the 330xd makes 185 hp at 4000 the torque is 300 ft at 2000 rpm the comp ratio is 7.6 i do a lot of heavy towing and hauling and i only paid 100.00 for the running b600 bus i know turbos are exspensive but i dont have much of a choice i have a 460 out of a 78 lincon but to put the 460 in my truck it is going to cost 1800.00 for the parts bellhouseing motor mounts having the block modiefied for the clutch ball any help would be great

hey streets why should i spend 80000.00 when all i want to do is use my f250 like it should be used and why should i spend 6 to 8 thousand for a 500 horse 390 you must think that us old ford truck owners have rolls royce bank accounts you must not drive a ford or you have acess to a free junk yard