Thanks for the quick responses.
I created a new master with the core64.gz file included and made reference to that in the isolinux.cfg file.
When I use the ezremaster program, I have the following apps listed "Inside initrd apps on boot":
Xlibs.tcz, Xprogs.tcz, wbar.tcz, flwm_topside.tcz, ezremaster.tcz, xcdroast-gtk2.tcz, xfe.tcz, xfe-common.tcz, zenity.tcz, tc-install.tcz,
I also have 2 extensions that I have built myself added.
However, when I boot off the new cd, the system loads extremely fast (about 6 times faster than the 32bit build) and fails to startx. When looking at the extensions that are installed, I see that Xvesa is installed instead of Xorg-7.6 and none of the other extensions that I specified are loaded.
Not sure what I am doing wrong.