Not so common as the muncie & t-10, but the 56-57 6 bolt top cover 3 speed is still a decent trans. But finding a floor shifter setup for what your doing would be alot harder.
Here's some pics that Py member Larry Gorden has posted before to show the differance in the bellhousings. 58-60 on the left, 55-57 on the right.
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Illinois Outlaw Gassers
6.27@107
9.97@131
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