I agree with Kingsbolt, if you dont set up your power steering system flow rate to work correctly with the steering rack used in your build, you will have over-assist. Several vendors sell the valves, SPEEDWAY motors has a good instruction sheet on their website on how to install it.
url='http://www.clubcobra.com/photopost/data/500/ps_cooler_2.jpg']
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I installed the shim kit for the pressure valve insid ethe saginaw pump. I also had to add a PS
oil cooler to lower the fluid temps to save the pump and rack seals from a painful death.[