It's for my '73 340 with an automatic. It's a Thermoquad 6321S I purchased from BOBSCARS here on FEBO. I bought the brass floats and choke parts separate from the kit. I agree, it looks like a great kit. Now to watch some vid's on how to re-build it this weekend. Not sure how to answer your question on bi-metal choke parts?That is a nice looking kit, with choke bimetal parts? Nice. is this Pre-1970?