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Please don't be offended if I state anything that may be construed as obvious--just want to be sure we're talking about the same things. You mentioned that your idle jet is the largest in the kit--a 160 in the primary. It sounds like you are actually refering to the main jet. The idle jets are located on the exterior of the carb, held in place by brass screw "holders"--one screwed into each side of the carb--and the jet slips into a recess on the inside. Normal range for the idle jets would be in the 30-50 area in increments of 5. The main jets are located in the float chamber, at the bottom, at an angle, one for each barrel with the primary (smaller of the two throttle plates) range in the area of 125-145 and in the secondary, 115-145. The air correction jets are found at the top of the carburetor body, alongside each barrel. You'll see numbers like 155-170. Under the air correction jets are the emulsion tubes which sometimes can be removed if the carb body is turned upside down with the a/c jet removed-but usually have to be fished out with a wire hook. The emulsion tubes come with different profiles and holes along their length and for the most part can be left alone-that gets into the area of very fine tuning-but if you have your carb apart you may want to see that they (and all passageways) aren't clogged. The accelerator pump jet which is also installed at the top of the carb body with its nozzles pointing down. They can be had in different jet sizes but what's more important is that they provide a good strong stream of fuel when the throttle is opened. That depends on the passageways being clear and the diaphragm in good shape (easy and cheap to replace). The problems you are having sound like something other than jetting issues. The condition of the distributor (bushings not worn, advance working, etc) and the rest of the ignition system being up to par are essential.
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