Looking for PCM options

I completely understand. I struggle with spending a bunch of money on that stuff instead of using it for swap parts and such.

If you want to stick to the GPEC2A that matches your harness, you are stuck having to do something to remove the CANBus start option like having Sublime or Hotwire flash it. Then you could build your own power harness with the missing PCM plug, body harness plug, a PDC and wiring diagrams.

Another option would be to ditch the stock harness and retrofit an NGC setup. The cam and crank sensors have to be swapped but after that everything should plug in and work, as I understand it. You could even start with a harness from an older Hemi like an '08, but you would have to add the VVT wires and check the pinouts to make sure nothing moved around. And if you wanted to run a 6.4 intake, you could add the SRV plug as well. Note that the car NGC can't seem to make the SRV work, so you have to either run a truck NGC or an RPM window switch.

Note that there are some tuning issues to get it running with the NGC as well, but it's all stuff you could do with an HPTuner's setup if you wanted. Actual tuning is beyond my plans but I should be able to turn of SKIM and the start signal over the CANBus if I wanted to.

I looked at the differences between the NGC and GPEC2/A controllers when I was trying to pick a direction. The NGC is older and slower, but easier to deal with since it doesn't have need an SSR (Start Signal Replicator) or a crate motor flash. At the same time, the NGC can't control the radiator fans like the GPEC2A can. In the end, I decided to run the NGC for my swap.

If you were going to try and run the 8HP off the stock PCM (if it was even possible), you couldn't do the NGC controller. But if that is going to be separate anyways, you have the option open.