you
could install side mounts
what vintage is the engine. do you know whether or not it has the long or short water pump. this makes a difference in what pump and pulleys to use
you can use any chevy 2 whl dr steering box from 73 up to 88/89 and also from crewcabs and suburbans to 91, somewhere around 1980 theey change hose fittings from SAE to metric and that is not hard to rectify
this fellow makes a good steering box adaptor and you will need one to mount the later str box
http://www.67-72chevytrucks.com/vboard/showthread.php?t=332923. his email is in the first thread
alan grove(GOOGLE) make relocation pump brackets and sych
ron