in my car (not an S12...) i shortened the prop 50mm when changing from a Mk2 S12 silvia box to S13 box. tailhousing of s13 box is 50mm longer and gearlever is 65mm further back so you may need to chop the trans tunnel.
i have pics of the s12 and s13 boxes stood next to one another on their bellhousings (ouch!) if you need them.
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