engine harness for $$$

I think the Holley stuff and MS3 has the best potential for things outside of running the motor, like traction control. And probably the easiest to tune.

The OEM stuff has probably 3 different options. If you want to use the VVT and SRV, I think you need to stick to at least ‘09-10 NGC. After that is the GPEC2 for 11-14 and then the 15+. The later ones (15+) are locked from the factory, but you can get a crate motor PCM from DIYHemi that is unlocked.

The OEM harness really isn’t a bad setup for a swap. The engine harness is really pretty self contained and just require some additional wires for things like power and fuel pump, ASD relay controls. DIYHemi sells a harness that plugs into the unmodified OEM engine harness and makes it a running setup.