how hard was it to adapt?
Not too bad.
Here is a link to some of my build
https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2147353/2.htmlOriginally intended to use / modify the factory wiring harness, but upon looking at the 40 lbs. Of wiring I decided to go with a hotwire harness. I sent them my computers, shifter, gas pedal, etc and $1800 dollars.
I used the tone wheel kit to supply wheel speed to the computers, and bought an adapter flange from the driveshaft shop to deal with the flange one the nag1 transmission. I only have a few dozen miles on it at its point, but it seems to work.
The custom headers, and my overkill fuel system cost me nearly as much as the engine/transmission pallet.