Need some help controlling body roll

There is an option for you, if you're not dead set on ralley wheels.
Go to your local boneyard (okay, Automotive Recycler...) and get a pair of Jeep "Canyon" aluminum rims off of a mid to late 90s Wrangler. They are 15x8, and have 5 1/5" backspacing, which is too deep for stock dimension A bodies- they will hit the springs. However, with your setup they should clear with room to spare, and give you another 1" of clearance at the wheel well lip.
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You may or may not need longer wheel studs for these rims, but they're cheap enough.
This will get you the right size wheel with the proper backspace at a dirt cheap price (I think I paid $15 at my local pick'n pull).
Drawbacks: Too much backspace for the front. And the centerbore is not cut all the way through the wheel, making fitment over the front spindle/hub impossible unless you have the centerbores cut all the way through (Note: this is not an issue on the rear axle).
For the front, you could use a similarly designed 15x7 wheel from mid to late 90s Grand Cherokees, with the aforementioned centerbore for hub clearance.
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Just a thought for you to get proper offset wheels "on the cheap" so you can go ahead with the EFI, too.