AEM and others are just reselling the same coil anyway
For OEM coils many like the D585, but do not dwell these over 4.5ms or they can fire prematurely. It's a very bad design in that respect. But all OEM coils are very powerful anyway. But always buy from reputable sources, as there are lots of Chinese crap out there.
The firing order is setup on the XIM when wiring the coils.
EST. Ignition Outputs Small block ford
Now the injector outputs start with #1 cylinder output EST E.
The XIM should be able to power any smart,LS coil. The crank and cam signals run to the XIM box and communicate through CAN to the XFI box. The dip switches need to be set accordingly to your application https://static.summitracing.com/global/images/instructions/cca-305008.pdf