New Headers Installation

I usually put the headers in after the motor, it's just part of my one man routine, I'm pretty sure you could install the driver's side header first, to give you wiggle room, and the passenger side practically falls in from the bottom.
The Z-bar is a simple mod, just make sure to re-weld the lever in the correct "clock" - or clutch adjustment problems will follow.
The bottom of the "clutch" lever should end up between the 2 top tubes .
Good luck . .