HR184 is the factory alky HR carb, look for one of those.
It is basically an alky converted HR181 with a larger low speed needle and all the correct drillings and nozzle. I have one but am not willing to part with it but there should be some out there. Check with Rob Voska.
Definitely the 184 was a gas carb. OEM for the K55 and other reed motors. Still a prefered legal stock carb. It has a drilled hole for high speed jet in venturi instead of check valve like the 181 and 191.