Fast ratio pitman and idler arms

my personal experience with bigish or low-profile tires on my 66 cuda, was that the welds on the steering box bracket on the k-member broke. Now whether that was an anomaly due to poor factory welds, I could not determine.
On the other hand, I had fast ratio PS on my 70 AAR, and I thought it was the slickest part of the whole AAR package. It gave very good road feel, much better than the regular old Chrysler PS feel.