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Kyle, I think we all agree that a trans swap is a good idea for your ride. Going the auto 200R4 or 700R4 route as redneck suggested will give you the much needed OD but will require the addition of the TC switch he mentioned as well as setting up the throttle valve cable to the 700R4 (I'm not familar with the 200R4) to allow it to function and shift correctly. All do-able but added complexity to a very basic car like yours (I really like basic cars, I'm a first gen GM F-Body guy at heart, Camaro/Firebird). You mentioned thinking about swapping in a 4 speed from a Nova and a GV gear splitter / OD unit. That would be a very expensive route to take, the Gear Vendors splitter/OD goes for about 3 grand! A much cheaper and simpler alternative would be to swap in a Borg Warner World Class (WC) 5 speed found in '89 and up Camaros. Of course you would need to add a clutch pedal and attached linkage, cut a shifter hole in your floor and find the correct length driveshaft or have one made or shortened. These boxes offer the same OD radios as the OD slushboxes mentioned earlier, .70/.73. Plus with a stick you can EOffC to push your MPGs even higher. Its not a difficult swap, I put a WC T5 in a '79 El Camino, everything needed was collected on 2 trips to the salvage yard. Also check out your rear gear ratio and look for something numerically lower at the parts yards, those I6's have nice low end torque (even better with the earlier mentioned cam!) and coupled with the low 1st gear on a 5 speed you can pull a pretty tall rear gear.
Good luck!
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