Don't bother upgrading the AOD if you don't like it now chances are you won't like it beefed up either. Swap out your auto for a 5 speed manual...something like a Tremec or T-5 World Class...you won't be sorry you did. I don't think that the swap kit is too much either.
BTW...aftermarket heads are worth every penny. Stock heads flow like crap...you definitely want the benefit of bigger intake and exhaust ports as well as bigger valves. Less weight with aluminums too. 
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Midnight Blue 89 GT... 306... ported and polished aluminum GT40's, MAC Long tubes, MAC power pipe, Flowmaster 2 1/2 cat back, GT40 intake with ported upper and lower, B-Cam, 24lb injectors, 77mm Mass Air, 65mm TB. World Class T5, 3.73's, Centerforce Dual Friction, FRP aluminum radiator, Victor Jr water pump, Pro 5.0 shifter, Crane adjustable FPR, 255lph fuel pump
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