New bb build fuel economy

I am/was (thanks inflation! :BangHead:) building a mild 440 for my truck (details in my signature) for mostly towing duties so low-end torque and fuel economy are priorities. I went with unported Stealth heads but my machinist strongly recommended a good valve job as the factory one is mediocre at best and a good valve job can really improve low-lift flow and velocity. Pistons are Icon forged pieces that will put the compression right around 9:1 (depending on final deck clearance and head gasket choice of course) so I can run regular gas and not have too much heat buildup when towing. For a cam I'm planning on getting a custom grind solid flat tappet (more just personal preference, don't trust hydraulic FT stuff much anymore but don't want to spend the $$$$ for a roller cam conversion) from Racer Brown with very mild specs, last he told me was something in the .430" lift range and 210-220* duration at .050" lift. For intake I'm using an Edelbrock RPM, actually the Mopar Performance copy I bought last year when there were just a few left in stock and before this crazy inflation hit. Carb will be the 750 cfm Street Demon I'm currently running on my Duster which has incredible street manners and is one of the best carbs available for gas mileage. And finally Hedman long tube headers with 1-3/4" primaries.

Truck currently gets 10 MPG with the mostly-stock 360 which I attribute to the heavy full-floating Dana 60 rear axle, 727 trans, terrible aerodynamics and oversize 33" tires, truck itself also weighs 4400 lbs unloaded with me in it. I don't think a fresh warmed-over 440 with raised compression could do much worse than that as long as I can resist driving with a lead foot lol.

I know it's not a stroked low-deck B engine and it's not finished so I can't confirm the performance but I hope it helps!