I had some time in the garage so I wanted to confirm the TDC mark on my balancer so I made a piston stop (heads on engine). I lowered the stop and marked the balancer (CW and CCW rotations) to find that the OEM groove is not in the middle of my two new marks. I checked this twice and both times the OEM groove is not in the middle of the two marks. My guess is that the mid way of the new marks is about an inch off of where the groove is located.

What are my options?

Do I just make a new mark on the balancer in the middle of these two piston stop mark and use the ZERO that is on the timing cover?

Do I need a new balancer?

This is an OEM style balancer with the timing marks on the drivers side which I believe is correct for the 1970 340.

Thanks
Dave