Rear Caliper Position - Any Advantages?

[DeltaT]

I am building up a 9" rear, and since I'm welding on the brake brackets, I have some latitude on how I position the rear calipers - right at 90 degrees, slightly higher, etc.

For example, this guy has his clocked slightly higher than the centerline:



And this guy's is slightly lower:



And most pictures I see, where the caliper is behind the axle line, the caliper is clocked right at 90 degrees.

Are there any advantages to clocking the calipers other than the standard 90 degrees, other than modest packaging considerations? Clearly I would get into bleeding issues if I went too far either direction.

Thanks,

Jim