Bad cam gear now what?

[barnfind08]

29 mODEL A quit. took off cover and half the teeth were gone. i know this is common. took the nut off and got the bad gear off(fibre) and was ready to put on a aluminum one i had. for the life of me i can not find a mark on the crank gear to line up to the cam gear. washed all the teeth and nothing. what is the sequence for doing it now? do not have a clue. thanks. i tried the archives but did not find something.