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Set the toe on the front end with a tape measure.Get it close to 0 or just a little toe in.
Fix the manifold problem, the high idle and fast idle cold are killing your mileage.
The manifold problem is also causing the fuel mixture to be incorrect to different cylinders with the system trying to compensate by enriching the mixture to the cylinder that is getting unmetered air (vacuum leak).
The rear end ride height is probably relatively minor as far as mileage. You could either lower the front or raise the rear depending on how much the rear is sagging.
regards
Mech
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