Big Block A body Mileage?

Hello all,

I am gathering parts for my 360 A body right now and it is going well. That being said, I have come across more big block stuff lately.

I have a 74 Duster that would accomodate the 440 real well.

I am aware that we don't build these cars for economy, but I do drive a minimum of 35 miles everytime I start the car. No less due to my location.

Assuming a mild 440, mid 3.00's gears and the Shumacher headers, any one have experience with mild 440's and mileage?

I have a sneaking suspicion that it will be better than my 4.10 geared .484 cammed 360........

Thanks for your help as always, ROB