Conversion Question

what if you used a rack from a car that used rear steer spindles?

The problem that you run into is finding a rack and pinion that has enough travel to have a decent turning radius and bump steer issues with the stock K-frame:

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


The muscle cars that came with steering gearboxes have a lot more travel than a rack and pinion gear can usually provide.
The length of the steering arm from the center of the ball joint to the center of the tie rod end dictates on how much the steering gearbox or rack need to travel .
On a mopar it' s like 7 or 7.5 inches , which means your rack and pinion needs to be able to have that much travel to get a full turn.
I have driven a car with a rack installed that you could not pull into a parking space without backing up and turning again to get parked.
Also when it hit a dip in the road the bump steer was bad enough it would move the steering wheel.
It can be done, but not what I would want to drive.
Probably better off with the quick ratio Borgeson box on a budget.
Unless you could use a custom rack that had adjustments and travel like this:

[ame="https://www.youtube.com/watch?v=OwT5ruol4yU"]Universal Steering System - Jay Leno's Garage - YouTube[/ame]

Last time I checked it's price was outrageous.