Oldiron29 about covered the mix/match I'd know of. The Regular, and I believe even pre-1929 15-30 would have the same butterfly and governor shaft mounting.
However, the 15-30 nearly for certain [2 carburator bolts for the waterbowl variant of the R, the RW], and probably different variations among 10-20 manifolds, same with the Regular, may not mount to your particualr manifold [likely 3bolt in the carb?].
If the cover was off the linkage and it sat outside you may have a rusty mess needing some soaking, else it really isn't that bad to take the linkage end off and pull the whole shaft out the carb side of the throttle tube [I know I use terms too interchangablely, the tube going from that to the governor is more of a "tube", while the one going to the carb better says "casting" to me].
A machinist should be able to get that idle screw drilled, and either removed with an extractor or retapped (though peeling the screw's threads away from the brass base is a likely a real bugger if the extractor doesn't take it), however, machine rates probably make a "new used" base cheaper unless you have a mill yourself.
The things [various components and complete carbs] do seem to pop up on ebay sporatically enough; else, I'd be rather surprised if Alderson or Fordson House [both can recieve a picture on email too, if you need to clarify the throttle mount] doesn't have a part reasonably priced, perhaps Rice Equipment even has an NOS base for that matter.
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