If you get the tune dialed in right on an EEC-IV or V it'll idle like a dream and behave wonderfully in normal daily driving situations, I don't really see a down side??
And expensive? I had a few spare 9AL's back in the day I sold for $60, people are literally giving away injectors now at all lb ratings and places like MPS have full wiring harnesses for MAF conversion etc.. Same for Intakes and TB's, they can be had at very reasonable prices at Forum classifieds, Ebay...
So if you pick up a 5.0L that has the stock EFI is it worth it to strip it down, then throw a carb and intake on it?? Wouldn't be the route I'd take!