[joyridin']

Maybe I'm missing something, but if you tune the 750 correctly, you should get about the same mileage as the 770 unless you are putting your foot to the floor all the time and kicking in the secondaries.

I have always had double pumpers and have never had a problem on the street at all. Put milder accelerator cams in the front and rear if it is coming on too hard. That will help the tip-in/tip-out if you feel it is too jerky. You can also change the squirter size, but for a 427, that shouldn't be an issue. Is it set-up for 4 bbl idle?