That's all fine and dandy, but your making power way up top. That is a characteristic that's fine for cars, or something that's at the track all the time. Not in a truck for the street, where stock, an original 350 puts out more torque lower down where you can actually use it. Or where you need it to move a heavy truck off the line.
With putting your power up so high, and your torque, you LOOSE fuel efficiency as the truck is not building power where as needed when driving, and is not being ran efficiently. Yes, 28mpg in a carbed 283 in a Vega is possible, that car is sub 3000 lbs if I recall right with an even smaller motor. But once your dealing with a 4000lbs steel
brick, the factors change a lot.
Hot rods are a lot lighter, and a ton more aerodynamic in most all cases. Fuel mileage is heavily changed based on drag, and trucks can't easily beat that. You should see some of the extremes that one has to go threw to achieve this, over on Ecomodder.
You've spent a lot of money building something that makes stock 350 power at higher RPMs, which would be
EXCELLENT in a Camaro, street rod, Vega, Miata, Se7en.... (I can dream), but for a truck, your going to get a totally different result on the street.
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With peak torque at 4,800 rpm, the 325 HP 305 would definitely need some stiff rear end gears (I'd suggest a minimum of 3.73 ratio) plus a high stall converter if the car had auto trans. In my opinion the WP Torquer heads are the better choice for a street engine. I think that a 300HP 305 with 308 ft/lbs at 3,900 rpm, would be a nice street / strip combination.
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Run what you will, and I applaud difference, but, there's better applications for a 305...
edit: meh, I'm grouchy, and irrelevant with this..