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The 87 tranny will physically fit, but lacks the intake side starter mount position. This is a problem if you plan on using the 20v header.
My personal opinion is that on an ST it doesn't make too much of a difference to use a 16v manifold. The st 20v unit is a little better, but the piping diameter is the same. On the BT however, the piping is a little larger in diameter for the larger exhaust ports, so using the stock 16v header here will be a problem, though if you don't mind a performance hit, can be done.
ST fwd trannys can be modded to work with the mr2. It involves drilling a hole for the selector shaft and oil seal. BT tranny's lack the oil seal casting, so cannot be converted as easily.
In general, with the ST you have a little more flexability.
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