Nova Power Steering Boxes

What's up guys, wanted some opinions and suggestions about power steering. I would like to know what would be the best brand to go with, there's not many different aftermarket brands I noticed for RWD cars between 64 and today. I noticed I've been seeing AGR boxes alot was wondering if that's a safe brand to go with? The main thing I want out of this thread is just a good brand name. Also if any of you have a power steering box 20:1 and if you like it. I don't know too much about power steering I just figured 12:1 is what the average car has. I just want fast precision turning like a BMW or a Benz. Money isn't an option I make lots of it, so I'm open to any suggestions on what the best set up in power steering would be.

I posted a thread on here a while back about buying a 502 ci crate, never happened I went with a 454 instead. So that's the engine size in case any of you where inquiring to know.

i have a 73 nova. i want to do a frame up restoration along with a few custom conversions. if you are interested, i'm trying to get rid of a few key components.

-the stock bench seats(front and rear), which were re-upholstered when i bought the car. black on black. vinyl and cloth. the seats look really good.
-the complete steering system under the hood. on not too sure on the nomenclature of all the stuff but i pretty much want to get rid of the whole system. from the steering wheel, to the power steering pump, gear box all the way up to what actually turns the tire. all the parts were working great before i took out the engine a few weeks ago.

i can get you pictures of everything if you'd like.