"chokes on both carbs"

Thank you, Jon
Thank you, Mike

That has been my experience with the 1960 261 on my 1954 Suburban, when I had two-216 versus two-235 carbs.

However, that old 261 now has a 2-barrel AA1 Holley Carburetor with adjustable jets. It (the carb) can be easily adjusted to idle nicely at very low RPM.

And, that 261 3106 can now easily/smoothly accelerate from standing-still to illegal speeds very nicely/impressively/quickly.