I have a 2020 6.4 Hemi & Trans I will be swapping in my 70 Charger. I have both computers, wiring harness ( cut at the firewall, with Shifter, Gas Pedal & Starter Push Button. What will I need to wire the motor to the car ? Also I guess y’all will have to unlock the Engine Computer ? Will I be able to make adjustments to the tune ?
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Also, take a look at the mopar performance crate engine instructions to help understand what I explained. This may help you understand your options depending on the route you take.
https://www.allmoparparts.com/docs/77072455AB.pdf
I built a 69 Roadrunner using the mopar engine harness, dakota digital dash, and the factory b body wiring. This consisted of integrating the fuel, fan, and ignition to the mopar engine harness while still using the factory b body dash harness to communicate all the lights, parking brake, steering column signals, wipers, etc. The dakota digital interface did complicate things a bit. I had to run signals to their computer to talk to the instrument cluster. I also added a OBD connector so the mopar harness would talk to the dakota digital system. Some of this was a guess on what info I would be able to see from the mopar harness to the dakota digital instrument cluster, but I was able to pick up inlet air temp and oil pressure. My speedometer signal is ran directly from the original 833 manual to the dakota digital computer using a pulse generator from dakota.
I believe your computer will have to be unlocked. DIYHEMI may be able to perform this for you, if not, HP Tuners can support. After that you will be able to make tuning adjustments. Hope this helps a bit.