[DonC]

Dennis:
Give Wayne at Very Cool Parts a call and pick his brain a little. I've spoken to him about the different systems and he's been very forthcoming about their capabilities.
Keep us posted on your decision and results since I am in the same boat as you with a 428FE and keeping the MSD ignition system (both box and distributor). Looking to go the EFI route for a street car.
DonC