Which Power Rack&Pinion easiest/cheapest install?

One of the obsticles would be that a power rack would be larger than a manual rack , you would have to deal with the oil pan and exhaust clearing it.

You could get a custom built power rack:
http://www.unisteer.com/seach_by_ve...t/unisteer_power_rear_steer_custom_built.html


You would have to get the angles just right to eliminate bump steer.
http://www.circletrack.com/chassistech/ctrp_1001_bump_steer_explained/viewall.html

Mock up an outer tie rod end with a bump steer gauge to figure out where you need to be as far as the racks inner width
http://www.speedwaymotors.com/Deco-Bump-Steer-Gauge,2703.html

You will loose a lot of steering turning radius with a rack because they aren't built to turn as much as a steering box, that would be the killer for a street car for me personally. Having to pull in then back up because the wheel wont turn enough to park would not be fun .The front steer kits like alter K and such use a spindle that is engineered for a rack.

http://www.crankshaftcoalition.com/wiki/Swapping_to_rack_and_pinion_steering