I'm working on this swap. New booster from a '78 280z. The pushrod appears to be too short. I the pic below, it is about right where I want it to be, about 12.5mm from the face of the aluminum spacer, but it is only threaded in 2 1/2 turns. I pulled the pushrod out of my old booster and it's the same length.
The pictures some people have posted in this thread that show the pushrod, they look different than both of mine. They seem to have 1/2" or more length in front of the nut. Suggestions?