I know the hot wire thing is popular but why not the FAST system? My car will have to be tuned as it will be a twin turboed 5.7 on 15psi... Just curious.....
Look at EFI Source for their "Gold Box" It's basically a Megasquirt but they have a drop on harness and a start up tune already programmed into it. It must also have the coil drivers built into it. Some other options are going to DIY Autotune and using the MS3X, or the MS3 Pro (Amp EFI), controllers. They all use Tuner Studio as the tuning platform. The only problem with these on a G3 is you will need to mount the coil drivers externally. This probably isn't a big deal in most situations, just more wires to deal with.
I don't have any experience with Holley systems, but I bet any of their systems will require external coil drivers for the G3 hemi.
While I don't have a G3 in my car, I do have MS3X on a 408 with a completely custom EFI setup. It's a slight learning curve, but once you understand what's going on, it's pretty easy.
