The hard lines take a 14mm wrench.

Get a deep 27mm or 1-1/16" socket from Home Depot. The cheapest they sell. Better made deep sockets have all sorts of internal gusseting that interferes with the return nipples. Cheaper sockets don't have that interference.

I thought the intake manifold bolts took a 6mm hex bit. Those darned injector line bosses get in the way of a ratchet extension. Use the longest bit with wobble tip. In fact I use a long hex key and vice grips. There's no published torque spec so I tighten by feel.

This is the parts list of injector line clips courtesy of gsxr in case yours no longer keep the lines from chafing -

8 @ 601-078-04-86 rubber shim
2 @ 601-078-02-41 3 line clip
6 @ 603-078-01-41 2 line clip
3 @ 601-078-26-41 solo clip

Glow plugs?

Sixto