Which Power Rack&Pinion easiest/cheapest install?

Most of the aftermarket applications change the linkage to front steer which provides more space for headers, etc.. All of the geometery changes in that.
Some do-it-yourself builds are maounting a rack from Dakota or whatever in the original rear steer position but I haven't seen that done with a power rack. The heat from any exhaust might be the underlying reason.
There is nothing wrong with the original power steering if it isn't worn out.
In fact a steering rack might not be considered an upgrade by some.
I like having a little lost motion in the steering wheel on the interstate.