I just installed the 82750 on my 331 this past weekend.
GREAT CARB!!!
All I did was set the mixture screws and drop the front float just a tad.
Nothing else including the idle speed. It was right where I wanted it after I set the mixture.
Runs fantastic out of the box.
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'89 LX 408...SCAT, Probe, AFR 205, Vic Jr, Pro-Systems, Rawls sft cam, UPR K & arms w/coil overs.....more to come!