Upgrading front suspension in my 64 cuda

ive been looking at some firm feel suspension and can say i am impressed.

my question is, im putting a 360 mag in the cuda. Will the stock pitman arm and idler arm (going with a firm feel roller) hold up well? any issues i might run into?

I would like the car driver very nicely, very minimal slop in the steering. Any way to upgrade the manual steering box? or will nice new bushing suspension, roller idler, nice wide 17" wheels up front, sway bar, adjustable strut arms and nice pst torsion bars do the trick?