Im Running 64bit MAC OSX 10.6.6 with Chameleon Bootloader, i was trying to install OSX 10.6.8 with Chimera 1.4.1 bootloader to be prepared for OSX 10.7 (Lion) installation, what i did is on a new hard drive:
1- I installed 10.6.0 on a new gard drive
2- install 10.6.8 Jumbo upgrade
3- install Multibeast 3.8.0.

When i booted the machine, it can boot normally , but if i boot with arch=X86_64 parameter, the machine always hangs and hard drive stops rotating just before
Waiting for DSMOS

Anybody can help?

Does Chimera bootloader supports 64bit kernel ?

Regards.