The original worm IIRC is driven by the ends of the spur teeth. There's a imprint in the end of the nylon gear.
The gear number quoted in the Bailey's link is the same as the number for a 350 with a spur sprocket in the Husqvarna IPL.
My 346 gear is driven by the end of the rim drive teeth of the clutch bell?
When I changed my 346 to use a 357XP clutch bell with the bigger rim, the rim drive teeth on the bell are larger in diameter but the 346XP seems to oil just fine.