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Do you still have all the stock rear suspension attach points in reasonable condition? If so, I would install the rear control arms so that they are symmetric. If you are using aftermarket eccentric bushings, then make sure the left side and right side are mirror image of each other. When I first set up my suspension after chassis mods this is what I did (using the eccentric bushing). 1. I installed the front and rear bushings on the rear control arm such the the holes were outboard and up and one of the flats on the eccentric bushings was level to the floor. I took a straight edge and laid it across the bottom flat of the bushing on either side of the car. If the straight edge sat flush on the flat of both bushings, then I knew they were square to each other. I did this for the bushings at the front and rear of the control arms. This gave me a good starting point that was symmetric and square to the car. This step above doesn't guarantee 0 toe, it just established symmetry and squareness to the rear attach points. The next step is to set the toe (at least roughly until you can get to an alignment shop) 2. Scribe a line near the centerline of both rear tires. I do this by jacking the tire so that it is a few inches off the ground. I then support a scribe or small flat head screw driver near the middle of the tire and rotate the tire by hand to scribe a line around the circumference of the tire. 3. Set the tires back on the ground and settle the rear suspension. 4. Measure the distance between the scribe lines at the front of the tire and at the back of the tire. Try to measure as high up on the tire as possible and measure at the same height front and back. 5. Subtract the front measurement from the back measurement. If the front side is longer you'll get a negative sum and you have toe out. If the rear side is longer, you'll have a positive sum and you have toe in. You want to start with zero toe (front and rear measurement equal or slightly toe in (<1/8" total) If you do need to adjust, do it equally on both sides by turn the eccentric bushing on opposing sides an equal amount but in opposite directions. You want to try and maintain symmetry in your rear suspension set-up.