There was a thread on the 1/2A section here not long ago about modifying a TD venturi and mounting it to the Wasp .061, so you might want to search the forum here. I did one just to try it and it worked out OK. i bought all the stuff from the typical Cox vendors on eBay and followed some one's detailed instructions from the thread. I haven't run it yet but have no reason to think it won't work.
Type at you later,
Dan McEntee