I disassembled the carb on my Matchless G3l bike. Not sure the history on the bike. The carb body is stamped 275/402R. It looks to have been stamped more than once and I think the R denotes a replacement. The jet block is a bit battered. It looks to be stamped 33 on the top and 30T on the bottom. I measured the bore at .995 so closer to 1” than 7/8”.

I would like to get a replacement jet block maybe a new throttle slide too.

I am not sure that the carb is correct or correctly marked