[kyleb]

What if you’ve done all that and the corner mixture screws have an effect but it still smells rich at idle.
I turn the corner idle screws in on my 347 stroker (quickfuel 650dp) and it stumbles at about 1/2 turn from bottoming on all four screws but still smells extremely rich.
I modified the secondary so I can adjust the idle without removing the carb.
I set the primary with the transfer slot square then adjust idle with secondary adjustment.
Sorry to hijack but answers may help your situation as well.
Cheers