I did a fresh install (retail .mpkg way from ihackintosh.com) of snow leopard 10.6 and then installed MacOSXUpdCombo10.6.4.dmg update and it KP'd during "writing receipts" and I thought all was lost. . .

I then rebooted once which then rebooted by itself to finish updating and low and behold, it started up. . .

I then installed legacy_kernel-10.4.0.pkg which replaced the old modbin mach_kernel.test7 kernel and had to use an older IOUSBFamily.kext

all is well. . .so far