[jimbonice]

Car Craft did a 496 build with peanut ports a couple of years back. 9.6 -1 pistons, mild cam, big torque in the 600 ft/lb range iirc.
I've got 4.11's behind a built 700r4 in my 454 dually. It's been towing fine for about ten years now. The 3-1 first gear is nice to get large loads moving. Rpm at 60 mph is way higher than 1600, though, more like 2100. As far as towing in overdrive, I can't think of any transmission, automatic or standard, where it is recommended. If you want to keep your rpm's down, look at 3.54's. I used to have a 460 powered F-350 with these gears and a 5 speed, and it towed very nicely in 4th direct. One of the nice things about having big, tourqey motors is that you don't need stump pulling gears.
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