That's great info on the coils/flywheels. I have images of all your pictures stored on my PC. Thanks!
The picture of the early 3- coil hole mount 064 w/adapted coil is very interesting to me; I've got one (1201 flywheel) with a dead bosch coil. I've wondered about making an adapter to use the other common 2-bolt pattern coils. If you had a description of the adapter and/or could get some pics that would be great. I've been looking for a "dogleg 046 coil as those will also fit the early 3-bolt pattern 064. Maybe I'll just make an adapter now.
I don't have much info on WJ-10 carb. I found it listed in my technical reference guide as a 064 carb with following info. (It's not in my IPLs for 064 or 066)
WJ10 is a 064 carb PN 1122 120 0602, repair kit 1122 007 1060 (common to all 064/066 WJ carbs), substitute carb is WJ67 1122 120 0621 ( a 066 carb), vendor repair kit 0000 007 1066
The IPLs list various jet sizes for the carbs listed: 0.62, 0.64, 0.74. The smallest one mentions high altitude applications.
Not sure if this is helpful?