1. 10" to the -- ack, dunno what you call it -- where it necks down to the smaller, flat-sided shaft that extends down to the rag joint. Measured from horizontal center of the column at the firewall (would be longer measured from the top, shorter measured from the bottom). Sure hope that made sense...
2. Upper rain gutter is 7/8". Wiring channel below that is 1 1/4" total, and 1 1/16" to edge of rolled lip.
3. 5" to the underside of the brake pedal (no clutch, I have an auto trans). This is with an oem-style rubber floormat, with oem pad underneath.