Take out some spark plugs, put the car in neutral and turn the engine by hand with the fan or better yet, the belt. Yeah, yeah, yeah.........a no no in some circles but honestly, if your fan is not cracked, you've released enough pressure with the sparks out and you're not rocking thousands of pounds with one hand and trying to find the allusive dimple at the same time with the other. I've done this many times and found the dimple easy as pie. Then I set the timing with the New Rex wrench and bingo....good to go!
PS.....the dimple is a very subtle indentation and it's easy to miss it.
Here is an old Barn discussion on this.
https://www.fordbarn.com/forum/showt...and+crank+sale