68,clutch linkage problems
Did you weld a bracket on the frame for the end of the Z-bar? If so, I hope you had the engine and tranny in and tight when you made the measurements, otherwise, the engine angle will screw up your linkage. I know because I made that initial mistake on my 73 when converting.
Adjust the clutch rod (that comes out of the pedal) all the way out, so that the z-bar top is tilted to the front of the engine. If you can't get any clutch throw that way, you've got something wrong in your linkage set-up. Post pictures and we can figure it out.
Jim





