Bumping this up for a final word.
Just got done talking to Chris (Spud) Miller, owner of FIE (Fuel Injection Enterprises). In general terms, each percent improvement in flowmatch spread is about 5-10hp due to increased fuel efficiency and more evenly matched AFR per cylinder.
In BillBoosts' case, assuming he has 2% injectors in his car right now, he'* going to FEEL the improvement from these 0% injectors. I'd bet money on the butt-dyno for this one.
Technically speaking, I was under 2% originally, and improved a full percent (1.88% down to 0.8%). I should have felt it, but didn't drive the car for a couple months afterwards (and the car hadn't been driven for 4 months before that). Had I done the swap in one short day, I'm sure I'd have felt it.