for the money, gears will make the biggest difference.. you can get gears for the 7.5... but you might look into swapping in an 8.8 from a later stang and the gears..the rear is pretty common..if the car is mildy built or stock, the 7.5 will be fine :-)
to run headers on the 83, you'll either need a set of long tubes and a new y-pipe into the stock exhaust, or shorties and the rest of the exhaust off an 86-up stang..
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