FWIW...I have a Pro Systems 1150 based 1200 cfm Dominator on my 572" Hemi. I contacted them a few years ago to see about converting it over to E-85...they said they'd want to start w/ a 1250 main body. Something about the added volume of fuel, they'd want the bigger carb body and extra air flow. At that point it made more sense to just buy the E-85 carb complete than to have my good working carb converted...didn't want to spend that much at the time, so I never went ahead w/ it.