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As said, going manual is going to lose the torque multiplication given by the torque converter off the line and when unlocked. 2.73's and a manual will be a chore every time you get rolling from a stop, lots of clutch finesse.
Not to mention - what's the cost and time to go to a manual? I know others have done it, but seems very involved to try and save gas. I would guess it would be very difficult to pull off for less than $1000, and lots of fabrication time. I'd definitely start with a rear gear swap. While still costly, it much more easily doable. I also would take some time to think about what speed you drive, what rpm the converter can lock in 4th gear (and under what loads). It wouldn't be a great thing to go to 2.73's and then find that load/rpm means the converter stays unlocked until 65 mph or something.
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