1968 340 harmonic balancer and main pulley

Can anyone help me figure out what I need to replace/upgrade a seemingly janky/wobbling harmonic balancer and main pulley?

I have a 1970 340 TA 6 pack motor in my 1968 Dodge Dart GT. I believe when I had the motor installed, the old harmonic balancer and pulley was used. It wobbled in the pre ious 1973 360 motor that was in the car when I bought it.

I know there is a inherent problem be ause the timing marks are on the passenger side and I believe part of the timing housing on the 1968?