I’m the one doing the install, so I’ll have plenty of time ahead of me to learn lol
You're going to want to have a specialist on speed dial, a tuner, and someone who knows how to disable parts of the PCM's tune that will prevent spark. The only one I've been involved with was a Hellcat install into an old Coronet. We flew in 2 guys from Diablosport to get the engine to start and it took them 5 days. There are tons of security checks and parameters built into that PCM that checks for so many, what we would think, asinine things like I mentioned earlier.
It's not a plug-and-play friendly engine by any stretch of the imagination. It's one thing to swap from a 6.4 to a 6.2, since it has very similar wiring and connections. But, putting it into a custom car is beyond my knowledge. Mechanically it goes in fine. It's all the damn electronics and error codes that start pumping out (in our case, we had 50+ to chase down).
After we paid for their room and board and fee, I think it cost us more to have them start the engine than it did for us to install it. It's been a few years, but it was expensive. I didn't pay for it, the owner did, but it was expensive.