kdsheldon said:
I figured the transmission swap would lead to a small mileage improvement, the C6 being famously inefficient and all...
So you are willing to go through the whole process of swapping out to a Windsor (351W efi at that), motor mounts, drivetrain cross-member, and transmission etc. just to gain MAYBE 2 miles per gallon and help with the stalling???
For the stalling off-camber, I would install a Quadrajet. If you already have one, a rebuild may be necessary.
You stated you sometimes get "11 mpg!!" in your 460/C6 '79 Bronco, that is a great mpg for your vehicle's weight and engine/trans. combo. I doubt you would see better numbers in your Bronco with a 351W/NP435 combo.
Why a NP435?? Do you already have one?? Think it'll be easy to swap in?? Why not a ZF 5-speed?
Numerous pros/cons exist for MANUALS as well as AUTOS. I wouldn't say C6's are famously inefficient. All autos are somewhat less efficient when directly compared with manuals regarding the transfer of engine power to the drivetrain. Yet, they have advantages over manuals too.