I've got stock factory P/S, but I'm also running 7 degrees of caster (strut rods shortened all the way and a couple of alignment shims slipped behind the forward UCA attachment). Yeah, there's the center-steer dead spot (about 1" at the rim of my 13" diam steering wheel) but everything else is good enough that I'm willing to live with it. Rode's Restoration in Galion OH did something during the rebuild of my control valve to reduce the dead spot.
70 Mustang Vert--Konis, Addco, springs, Shelby drop, SSBC front discs, 2.75:1 T-lok, Magstars, Michelin X-Ones, 302, Autolite 4100, cam, Hipo manifolds, C-4. Not a car like I had when I was a kid--rather, a car like I WANTED to have when I was a kid.
Also into American Flyer electric trains--Its never too late to have a happy childhood.