Anticipation of Balancer purchase question

The mark is not in the same place 70 up and 69 down on the balancer.

Some say it is but I have a 70 up timing cover and a 67 273 balancer with bolt on pass side marker.

No matter which cylinder I use the timing is not the same on both markers. It's about 10 to 15 deg different.

That being said...

If you have a 69 timing marker and a 70 up balancer. It's not hard to find TDC and mark the new balancer for TDC