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Interesting, I went through the same whole thing with an 81 Fairmont installing 7200VV. I put the whole feedback circuit on the car and had it operating perfectly. I still have the took kit and books on that carb.
It only took me 20 minutes to get the base settings right on the dyno using the emissions analyzer at the shop.
Like with the tvs, having the right tools that are in good working order make all the difference in the world.
I suspect many of the house call techs were just tube changers with very limited knowledge and equipment. And time has proven over and over that giving the consumer any kind of adjustment ability is bad.
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