We put one in a 1965 D100 recently. Check "chopped up sweet sweptline" group on Facebook. Lots of pics posted there.

A guy makes a kit which helps with the install.

One of the annoying things is the factory steering column is not supported well near the bottom of the tube so removing the factory steering box removes its support. The steering shaft to connect the factory column to the Crown Vic steering rack may need some support, depending on how long it is on your application.