First of all any 318 or 360 TBI engine is not a Mag engine. Period. The 5.2 Magnum engines showed up in 1992, the 5.9 Mag engines a couple of years later.

Enginequest heads can be had with either LA or Mag intake faces.

The OP's question was to swap an "EFI Magnum". That seems to indicate the preference for fuel injection, so suggesting a carb is not answering the question.

I seem to remember that none of the Mag engines had advance built into the distributor. It's all done in the ECM.

The more complete package you swap into the older car, the better. The easiest way to do that is keep the computer and wiring harness with the engine, as I see it.

R.