Hi there,
There has been some posts about mounting various power steering pumps to a SBF. Be aware that the Mustang II power steering rack likes less than 800psi pressure; spec max is 1000. GM pumps (and others) put out too much pressure and need to be modified to prevent blowing up the rack; or use a Heidts proportioning valve to reduce pressure and give more steering feel. Check internet for pressure reducing methods.
Enjoy,
Jeff