The balancer I have off of the '70 340 I'm rebuilding isn't broken, just well work, the rubber thats exposed on the backside is cracked and dryrotted. the tin hub was cocked a little and I was able to straighten it back down..

But I have a '74 318 balancer that is near identical except for some numbers, and the position of the timing mark.

If I relocated the timing mark, am I good to go? the rubber in it looks like new.

I clocked both of them the same and marked where the timing mark shows up