[cwcarpenter98]

When swapping to the squarebody power steering gear, you will need to shorten the one piece steering shaft in your stock 66 column. There's a couple ways to go about doing that.
One way is to just shorten the column, use the Captainfab piece that you can order along with the power steering gear frame bracket, and use the squarebody rag joint.
Another option is to shorten the column and use a steering shaft u joint to make the adaptation.
A third option is to use the steering column shaft from a 69-72 truck column that also has a collapsible shaft. It will fit in your 66 column and allow the use of the stock steering wheel and squarebody rag joint. The benefit of this route is you get a collapsible intermediate shaft that reduces the chance of taking a steering column to the chest if someone pulls out in front of you.