if the 3.8 is aa fresh rebuild it is worth keepin till it blows i just rebuilt 1 for an 89 t-bird and its great. The 90 did come w/ a manual trans and they did have the option of a 4.6 In my experience its hard enough just trying to swap a 3.8 w/ a 3.8 i wouldnt bother changin that right away
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