Steers like Crap

I converted to a Flaming River 16:1 manual steering box but there is always play in the steering and the wide tires track the pavement. I am running 275/55/18 front Goodyear performance tiresI do 140 mph and lots of 100 mph runs so I need to figure out something different . I have read that not everyone loves there Flaming river steering box . not a slam dunk
All suspension using polyurethane bushings, new ball joints, new upper control arms from Performance suspension, sway bar , ect....

I have had it aligned 3x , different formulas , stock is the best
I am constantly adjusting The Flaming river gear box, always has play. I wish I bought a 20:1 vs a 16:1 because it is so had to turn at a stand still plus I think the car would be more stable at speed
I am going back to a Power steering set up
I considered rack and pinion but i read it sucks for a 69 Cuda, opinions welcome .
Rack n Pinion is unbelievably awesome on my Mustang !!!
Can someone recommend a good tight power steering set up or possibly a GOOD racj n pinion set-up

Thx