Yea. I’m spoiled by looking at lots of EFI data from my truck and watching a dead steady o2 on that. I strive to make my carbureted stuff run similar to that. Lean idle and cruise, slightly leaner light acceleration and fat wot.
I figured that :)
I think Mark's 2x4bbl will be fine at 12.5
There is a lot going on there (at idle) that could be tested and trialed.
My recollection (it could be wrong) was that 12" Hg in drive is pretty decent with the cam etc.
On the other hand, I'd love to see less rpm drop.
Anyway that's its own rabbit hole - although not entirely seperate from what happens in the transistion circuit.