Confused what to do with a 5.9L serpentine setup

My question would be why not use the RT pump, even if it is "low pressure"? Many people spend the time to drop the pressure in their original pumps anyway to increase road feel and reduce twitchiness, since stock A bodies tend to be overpumped anyway.
What accessories are you trying to mount, and into what?
I want to run an alternator and power steering pump. I went from a manual steering car to a Borgeson quick ratio PS steering box. I just didn't want to go through all the effort and expense of getting all the components together only to find out the low pressure pump doesn't work with my power steering box. I really didn't like the look or more importantly how high the original alternator was mounted on the stock magnum accessories, plus the PS pump is waaay off to the driver side as well.