Retune my entire carb after installing new heads?

Leave it where it is?? Gee, why didn't I think of that :D

AJ, thanks for your input. To get this cam to idle (using the old seat duration/overlap with the regrind, it's now 312/312/107 in at 105) it takes a lot of air since the stable rpm is, as I've said, at least 1100. It will idle slower than that (by a little), but not for long. Signal to the carb gets weaker, idle leans out, rpm and vacuum drops, signal gets weaker... it might idle a little lower if I made it deliberately over-rich, but as I mentioned that is smelly and not good for plugs. Remember this is street/strip...

The throttles would be open too far for the primary t-slots to be square. So the primary idle speed screw is set for proper t-slot exposure. Then there are .100 holes in all four blades, an adjustable PCV, and the idle speed is set with the secondaries.

Your theory sounds interesting, but does not account for the fact that only so much fuel can be supplied by the t-slots. When using up too much of that fuel at idle, there will be a lean flat spot before the mains come on.

Once again, I am not worried about whether this engine idles at 950 or 1100... all I wanted to know is, do all the fuel parameters have to change. Apparently they do :)