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What are you refering to by the upper control arm being ahead of the lower? The upper ball joint is behind the lower (it has to be to have positive caster). The upper inner pivots are between the two lower pivots although that shouldn't make any difference. The spindle adapter comes forward for clearance of the castle nut, meaning the ball joint may angle forward slightly, but as long as the ball joints are in the right place and free to move the shape of the spindle is not important.
The Ford parts did not have an upper control arm in the first place so there is no relationship to draw from.
We normaly end up with 2-3 degrees of caster in although some people prefer as much as 5, above that the steering becomes very heavy and I don't know anyone running above 6, I don't even think there is enough adjustment to get it that far.
Jim
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