Try this instead :

1. Backup the kernel to file mach_kernel_old
2. Fix permissions etc. for the backed up kernel.
3. Install the update.
4. Reboot with "mach_kernel_old" flag.
5. When booted just delete the kernel, and rename the back up one to "mach_kernel".

This should help. Andy's kernel works with 10.6.8 just fine, so after the update you might want to update the kernel in the same way, to avoid problems.

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