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A 4 speed and 2.73 gears in the rear end should give you the best highway mileage. Best all around gears would probably be a set of 3.23's.
That Chrysler Automatic transmission is the biggest drain on your fuel mileage.
One the HP loss is probably close to 20%, and the auto box weighs an extra 100 lbs over the manual box.
The other factor is it doesn't have a locking torque converter. Slippage in the torque converter is killing your highway fuel mileage. The transmission swap should be good for at least 3 mpg maybe 4 if you get lucky.
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