Internally balanced 340 questions

I have a 72 340 I had built with a forged crank. The guy I purchased crank from sent harmonic balancer with it but not sure if its the correct one.
My flywheel will need to be changed for internally balanced crank as well?
Any input on these pics and what I need to do would be greatly appreciated.
I already changed timing cover and water pump to accommodate internal balancing.