Alan,

There are several ways to convert your power assist to power steering. Check the photo galleries on this site under 1967 F250 4x4, I recently did a power steering swap on my 1967 F250 Crewcab 4x4. The pictures will pretty much tell the whole story. Also, there is a guy up in Alaska that did one of these swaps but used a p/s box out of a 78/79 F250 4x4. His truck is a 70 or 72 and he posted the pics of the swap in the photo galleries as well. It's worth a look. In addition, go to ebay and type in "highboy steering" on the search line and you can find several kits that people make and sell to do p/s swaps.