Chad,Mark`s put you on the right path. The AFX spindles will help you a lot too. The extra spindle height and drop vs. the MII spindles will help the lateral RC migration too. The fact that they take a bolt on steering arm is also nice once you get to doing the steering. The 7* spindle inclination will make it easier to get a longer upper vs. lower arm length ratio as well.
Your latest arm lengths are just about on for the AFX spindles. Set it up so that the upper ball joints are about 1" higher than the inner pickup points at ride height,with the AFX tall spindles and the arm lengths you mentioned (17"/9") and you should be able to get a VERY STABLE RC (less than 1/2" lateral migration at 2* roll) about 3.5"-4" in height,a FVSA around 110-120" and camber gain around .75*/in from ride height. You`ll have to mess with the vertical pickup points to get it that good but you`ll be in the ballpark.
We`ve designed several clean sheet suspensions around the AFX spindles and though different from yours they were close enough that those numbers should get you in the ball park.
In the rear I`d stick with a good 3 link. The C4L suspension is easier to make work well on a circle track car where it`s binding and roll steer characteristics can be used to your advantage than it is on a ProTouring vehicle that has to turn well right as well as left and without any banking. Mark SC&C
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