why go to a toyota power steering box; is it because it would be cheaper to buy?
73-87 chevy truck ps is a common conversion and is a good box. you can get an adaptor plate and a new column connector from Captainfab;
http://www.67-72chevytrucks.com/vboard/showthread.php?t=332923 and yhey are reasonable and he will look after you if you are having any problems
ron
