Sounds like a great plan and a great vehicle choice! Here's your first piece of advice: 3.55 or 3.73 gears! You have a .5 OD in that T56 and a lot of weight to move.
There are no bolt in rack & pinion setups for A-bodys yet so you may have to concede that one unless you're willing to do a lot of customization.
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Derek and Randy, there's another Impala owner in the house!