I'm probably not alone in saying this, but if you talk to any serious engine builder they'll likely tell you the only way to do EFI on a classic V8 is to do a multiport or Hilborn 8 stack style EFI setup with a fully programmable ECU and have the car tuned by a knowledgeable tuner on a dyno. That way the tune fits your exact car with your exact powertrain. While my experience with these "self tuning" systems was affected by admittedly crappy engine build issues, I still kinda got the feeling that it spent more time learning than it actually did running.
I did keep the 383 that came out of the Pantera, and I've been toying around with the idea of finding something else to destroy my bank account on. I may revisit the EFI question when I figure out what that may be.