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If you didn't have a known and symmetrical alignment than you really can't make any educated decisions about where to go next! On some cars, just a hair of toe out on either end makes the car almost undrivable. I agree w/ Poorman, go to a convensional set up with a good alignment (infront: 7 caster, 2.9-3.5 camber, 0 toe), take notes and go from there.
Re the 86 steering rack, I believe that all of that work was just to make room for the rotary. 13b has no conventional sump to create clearance for a rack, so it has to be infront of the engine. You can swap the stock spindles sides so that the steering arms are in front, then mount the steering rack infront of the engine.
I considered doing a similar set up once I got the drysump for my build, but I realized that the bellhousing/flywheel and trans sit so low that there's no point. Even if the rack wasn't below my engine, I couldn't lower my engine anymore because the trans would drag on the ground while maintaining proper pinion angle to the diff.
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