1966 slant six 170 timing mark

Thanks man. I'll clean that thing off and see what I can find. I was looking for a timing mark/slit in the top of the balancer but couldn't find it to save my life. Should there be a bolt in it going into the crank? I didn't feel one.
It's there. It might be really light. Also, when you get the mark on zero on #1 tdc, the distributor rotor should point to "about" the 5 o'clock position as long as it's been installed correctly.