Timing tab

I bought a passenger side timing marker here on the forum. The pre 68 small blocks used a bolt on passenger side one. I lined up the drivers side one with the engine off and made a mark with a dremel tool on the damper on the passenger side to line up with TDC on my new timing tab. You could also use a timing stop to do it.

I have heard the 90 degree thing too, but don’t know if it is true.