Looking to upgrade to a 3 phase charging sytem

[Speeddog]

Here's a pic of cranks, all 3-phase, except for the second from left.

That's a long-snout single phase crank.



AFAIK, you could fit a 3-phase crank and associated rotor, stator, alternator sidecover, and Voltage R/R.
But it would require removing your motor and splitting the cases, etc......

As others have said, easier to fit a later model engine already equipped with the 3-phase parts.
But many people here do not follow the "easier" path.