5.7 Hemi, Cable Driven Throttle, kickdown linkage for 3 speed auto

First off, Greatly appreciate you posting your bracket, that will help a bunch of PPL. Very clean setup, and very nice ride/setup.

few points on my end.

The Fast...is not my first choice...or second choice. I do agree you may have something on the table with it vs the holley, or even a professionally tuned OEM ECM.

Early and late reluctor engines are completely different animals as far as tuning goes.
We're comparing installing an engine with a mechanical TB that just needs a simple bracket made for a TV cable, Vs..

Mounting an electric gas pedal
running wires to that
mounting a double redundant bellcrank adaptor.
Running wires to that
and running a tv cable to that anyways

a box on the inner fender that has a servo in it, that mimics throttle position via a double redundant wired and mechanical linkage is not at all easier IMO.

Also don't forget that actually tuning the OEM PCM for a non-stock application costs $, and a diablo tuner only loads canned tunes, or custom tunes, it does not Tune itself, or provide a software to adjust parameters outside of very basic functions.

More than one way to tackle and project, and just food for thought.