after the "make kpkg --revision kernel....image... " command , do a "make modules " and then
"make modules install" , then install the ..image.deb and then modify lilo.conf , run lilo and
you should be able to boot the custum kernel (run these commands from the same kernel source as you compiled)

ps I you use initrd (look in /boot) , ad the "--initrd.img" command after the "make kpkg ......"