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The big thing to keep in mind on pinion angle and driveshaft angle is at the rear U joint the pinion shft and driveshaft should never be perfectly aligned sitting still, there should be visible V, even if it is only 2 to 3 degrees difference Never a upside down V All U joints need a difference in angle for them to work correctly, the needles need to rotate due to the diffeence in rotating angles or planes

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On a big tire/chassis car many times the centerline of the crank is lower than the centerline of the pinion. This makes the driveshaft run "uphill" towards the rear axle, leaving the rear u-joint angle in an "upside down V".