I had Cliff Ruggles rebuild my carb, when I got it back my MPG averaged 17 MPG running about 80 most of the time. TH-350 and 2.96 rear, can't tell you RPMs as my tach is a little screwy.
I have messed around with the idea of an OD trans. How well do they hold up to high HP (400 or so) in a street/strip car?