Ok I don't like the way the frame looks.................. but it Ain't my ride. With that said, the radius rods do NOT need to be parallel with the frame rails. Your main concern will be having the proper ammout of caster in the front axle 4 to 7 degrees. That is the king pins angled with top of king pin angled towards rear of car 4 to 7 degrees. Your front spring perch should have a similar angle, so the spring will not bind when you set the correct caster. As long as you have the correct caster your present setup should work fine.