The manual steering boxes are ALL small sector. Only the power steering boxes changed.
You mention you swapped the steering box as a unit, but do you have the '73+ idler and center link? Because that's the important information. If you want power steering now the pitman has to match the center link, and if you have the '70 center link you need the small sector ('72 down) power steering box. If you have the '73 center link, you can use the 73+ large sector power steering box with a new large sector pitman. The problem is that they don't make a large sector pitman to go with the '67-'72 steering center link.
