/6 Timing has me stumped!

I will admit, the slant six is kinda pesky to get timed right. I had a "little bit" of a time getting mine back right after I replaced the distributor. I timed it up before I ever pulled the distributor, so that had the engine timed. My problem was I kept getting the distributor off a tooth. I finally got it right though. It just took some fiddling with.