Yes Barry, Although as I said most pre war Amals had the 4 holes at the bottom mine doesn't on the B 29 and my H3 has the right holes but is sleeved to bring down to size. However my B 29 has a 274AZ/3A which it has run very successful over many years. Havent got the handbook handy but the jet, jetblock, needle size etc should be in there and those sizes should suit that carby. best of luck, Alan