Are you using the gullwing wishbones or the flat ones?
With the flat ones I would expect the rear track to be slightly wider, due to inaccuracies in the standard T-Plate. (Only a gnat's nadger wider.)
If you are using the gullwing wishbones then the rear track will be narrower, as the wishbones are shorter. It will still be wonky if you have the standard T-Plate. I actually made a "special" T-Plate for one customer who wanted to be able to achieve the maximum rear track when using the gullwing wishbones.
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