How interchangeable are 318 harmonic balancers?

I'd love to see some pictures of this car when you are done

presume its a 770 trim level car i.e 2 door hardtop 1968 dart body with the 1970s "European car" inspired grill ** and slightly compressed nose. definite mix of aussie US and Europeans (probably greeks and itallians, ex-pat communities that loved a valaint ) in the design studio in Aus at that time.

this was the car i wanted when i lived in OZ. trouble is i lived in a condo with short parking spaces and it would have blocked the garage... went with the charger instead about 1 foot shorter mid 60s B body width at the back... 1970s A body width up front.. that fitted perfectly well even if i had to get out and push it into the space :). brought it home to the UK expecting to be unique and discovered they sold about 250 here... VG would have been better from a uniqueness point of view i only know of 2 still running i know about 16 chargers.

Dave

**check out hillman hunter, ford cortina mk2, ford capri mk1, and austin allegro
horizontal bar ally grills and square headlamps all over the place and all designed in same period. while you guys were putting on big plastic nostrils and 5mph impact bumpers we were paying no heed to the safety of pedestrians :) then again most listed above would struggle to do a 18 second quater mile

Dave