340+ for the STREET

I'm convinced an OD trans is the best thing you can do for mileage. With all due respect, a 416 is going in the opposite direction And dont forget the extra $ for higher octane. I have a small block 68 cuda that gets 13-14 mpg w/ 3.23 gears.
My /6 64 Val got 23.8 driving to Carlisle, also with 3.23 and no OD.