Z bar alignment

The side with the wire clip locates the outboard side. The inner can fall wherever so long as the bushings are in the tube a ways.
As the engine torques over under every shift, the inner ball will tend to come out of the tube. I think my bar had a roll-pin in there to limit the inwards travel during mock-up. The clutch-pedal down rod should be well centered in the firewall opening, or the bellows-seal will not last long. Shim the apron side to get that right. Then shim the bell side to put the ball where it needs to be.
After that you may have to move the flat lever to get the link-rod to the clutch fork to line up, and not hit the headers or something else in there. It's pretty tight in there.
I believe the 7" is correct.