You may want to look up and contact CC member 'twin turbo' (
Club Cobra - View Profile: twin turbo), he has a 'full manual AOD trans' behind a Dart block 331 that's fuel injected with twin turbos. He claims he gets 14 MPG in town, 20 MPG hwy, and has run a 10.0 second 1/4 mile at 144 MPH on "a dusty non prepped track." He has to be putting down a lot a HP to get those kind of numbers, so an AOD should work in your application.