I recently bought a ‘66 1600 and love it!!! It was running great for a few weeks but lately I have been having quite a few carb issues. It seems to be idling smoothly, but as soon as I put a load on it in gear, I get a weird sputter that isn’t altered by the choke. The floats are floating and the other chambers are topped off with 20 weight trans fluid. I replaced the plugs and wires and I am getting spark on all 4 points. I have an appt at a shop next week, but would love for any advice you could offer! Thanks for helping me keep my Lady on the road!