differance in p/s or manual heders?

All the 1 5/8 primary tube headers that I have seen will fit with power steering.
Most of the 1 3/4 & 1 7/8 will route #1 tube straight down from the port, thru the K-member & back to the collector.
The P/S steering box is bigger than the manual steering box, thats why you can't use most big tube headers.