how can i convert a 72 to disc

[runuover]

im in the process of bagging my truck and i dont think it sits low enough in the front so i need spindles but my truck has drums
how can i convert my truck to disc w/o having to buy the $900 kit that doesnt even redo the rest of the suspension
i already could use new tie rods and ball joints, is there a way to use newer model stuff w/o costing so much, $900 would be fine if it replaces my whole suspension up front w/ new stuff
i read about the 66 conversion how much of this stuff applys to my truck

thanks