The "snorkel" type carb is what I have on my 046 (they can be Walbro or Zama). They will fit on an 044 w/o interference, but have not run it that way yet.
The 046 filters the air that goes into that snorkel, so I'm not sure if just covering it with a cloth filer will "let it work". When I know, I'll let you know.
I got one for $18 shipped, could not pass it up!