Had a look at lunch and there is a casting number on the bottom of the bowl.
7003536 which is not on any of the lists in the Tips forums but there is
THIS post that I'll have to read through tonight.
But I'm also posting a picture of the exh manifold. Looks like there is a spot where a hot air tube was. Anything wrong with making my own from some steel fuel line if I can find the right diameter? I can bring it up to a flare fitting and plumb it into the carb from there?