Trust me on this because I have it - there isn't lots of room for power steering no matter what you might think. The tubes tuck between the steering gear and the block. I had two tubes that touched the steering gear #1 & #3. The steering coupler is flat up against the #7 tube.
Not that it matters, but I'll never recommend them to anybody. If they were a $150 generic Jeg's/Summit header, yeah. But $500+, no.