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Maybe a cam grind? I think I heard the automatics had a different cam profile and timing that favored low-rpm torque (and maybe economy?) I think the automatic version had less overlap, but I'm barely literate in this area, so I could be totally wrong.
Maybe bump up the compression a little, if there's room? Hotter thermostat?
It would probably be a convenient time to switch in a manual rack if you want to, and delete all the air conditioning hardware if you have it and don't need it.
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