Only advantage I'm aware of is positive ignition timing without any slop from timing sets of any kind or cam twist.
As for difficulty of install, if you use a balancer that will accept SBC pulleys you should be able to bolt the trigger wheel on, then the hardest part would be making a solid enough mount for the magnetic pickup.
I haven't used MSD's setup, the ones I have used (
SDS EFI ) said to make the mount for the trigger strong (rigid) enough to jack up the engine with, without damage (bending) of the mount.
Not all that difficult if there are any unused mounting bolt holes anywhere close on the engine.
