I don't have all the measurements in front of me but expecting 6 degrees of caster from just the offset bushings and shims is ambitious IMO, maybe 4.5 degrees from both upper and lower which is good target for a narrow body car.
I modified my a-arms and have a 3/4" spacer (i.e. moved the ball joint rearward) by that amount and I have 6.5 degrees of caster on a wide body GT5.
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