Because the major suspension loads on an A body Mopar are not taken at the shock absorber mounting points (like most Fords and some Chevrolets), and there are NO actual shock towers, bracing the shock absorber mounting points is redundant. Front suspension loads in an A body are taken at what is essentially the center of the chassis through the torsion bar crossmember and ultimately the passenger compartment floor.
After the addition of frame connectors and torque boxes, what IS important is bracing the engine box to keep it rigid, preventing the K frame and front subframe longitudinals from moving around and thereby keeping the front suspension pickup points in alignment with the main chassis.