Gonna repost this a little different. I'm finishing up a automatic to manual conversion. Can owners of 1968 firebirds that came stock with a 4 speed please kindly pop your hood and see if it appears if the speedo cable comes through the firewall behind the distributor to the driver side towards the top of the tunnel. I ask because I have seen pics of first gen camaros that did this and my 68 firEbird automatic and the camaro automatics routed the speedo cable out bottom driverside corner of firewall. Need to find out where firebirds with manual transmissions routed speedo cable. Please help much appreciated.
John

Ima a slush box kinda guy, but my 9 was a 3 speed manual. The speedo cable comes out of a dedicted hole, meaning it was punched/pressed during metal pressing.

Keep in mind that the 9 is, often, a stand alone from its older sisters. On the 9, at least on the v8 cars, the speedo comes out of the firewall regardless to the driveline. The best I can recall, is that sisters have the same configuration.

Mine goes through the firewall just to the left of the clutch pedal rod. Towards the fender from the place the clutch rod goes through and not quite as far as to be below the wire firewall junction box. It has a grommet around it that is held in the hole in the firewall with three metal tabs. A real pain to get the grommet over the end of the cable.

If the car had a muncie the speedo cable goes through the firewall by the dist.Saginaws go through the firewall to the left of the steering column.