What all will fit?

My thought was to get the OD trans rebuilt to handle like 450HP/450TQ, and get a converter/flex plate that matches up.

We also have a beater '04 Dakota QuadCab 2WD V-6 for parts.
I was "told" that I could use the accessory mounts from the V-6 to make everything play nice with the 5.9.

Does anyone have experience getting ~400HP out of a 5.9, but keeping the EFI?

It looks like she's going to be somewhere around 4500 lbs, not counting my fat ***.

With the OD, I was thinking 3.55 or 3.92 gears. IIRC, my '00 QuadCab 5.9 had 3.55's in her, and the R/T's had 3.92's.

Has anyone heard of these folks?
94-02 Dodge Ram / Durango / Dakota 5.2L / 5.9L V8 Stainless Racing Manifold Header Exhaust + Heat Wrap

I want to get a game plan before we start throwing cash at her.