Tunnel ram carb tuning

I have a few things to add from experience.. the first thing is the O2 sensor isn't the end all it's just like a dino it's a measuring stick... Definitely your plugs are the end all...
Second thing is I always thought I would adjust the carburetors both identical which seem to make sense but that's not true.... Secondaries sure but primaries might be a little different that's okay...
Third yes you may have to take a large swing at the Jets as these are getting half the signal they should be getting because they were probably built to run singular... A factory dual quad setup or a setup bot to run dual quads and generally jetted for such...
Without question right everything down then what the change did or didn't do.
And last but not least have patience because you're going to have to warm up the car at least a dozen times or more and take test runs till it comes right and it's going to take time... And several jet changes and adjustments...