Ooops, i got it wrong.
The harmonic balancer in the previous photo is a custom made one with a smaller pulley diameter
The one in these pictures is the Falcon one.
A custom hub was made & a new balancer from a mid '60's Falcon was used as it was just laying around. Notice that the pulley is machined into the rim of the outer ring.
It was abandined because the diameter of the pulley was too big & it spun the pump & altenator too fast

The new one [previous post] has the balancer in front of the pulley, allowing for the substantial reduction in pulley diameter.