It took a while, it's amazing how much time it takes to edit these things. Here's everything I know about verifying Ford Flathead TDC and which cylinder should be firing. I also show how a pointer made from 1/8" welding wire can be quite effective. I hope it will be the go to resource for any questions involving flatty timing marks.
Solid stop while heads are off would be my preference, but if you have an already built motor, cable tie works pretty good. I think if more care was taken over making the marks, the results would be very good.
Please have a look, I hope you all agree with how I did it, there's always some room for personal preferences, but please click like, and leave a comment.
https://youtu.be/dn446jjCVRg
Mart.