there are pulleys that can work out there ... and someone a while back posted one on a thread but who knows where that is hidden on the forum ...others are much more capable than me ..maybe someone got the info you need ....welcome to classic
You will not need any of the original charging circuit once you have an external alternator. You only need to unplug the stators 3 yellow AC wires from the RR
Here's a link to the information on alternator conversions on this site. It's not a hard job once you get it sorted out. These threads should help. viewforum.php?f=10