OK, don't know how the Haynes manual says to do it but this is how I do it on every engine I've ever built. (if its the same as the manual sorry in advance) StormTrooper, just between us............I've done that too, sshhhhh quiet.LOL
Take the valve covers off, Turn the engine to top dead center #1 cylinder (get the timing mark on the dampner to the timing tab on the front of the motor, If your not sure its #1 take your ignition cap off and see if the ignition rotor is pointed to the #1 post) Using your manual to show cylinder location your ready. Now with the engine on #1 TDC adjust the INTAKE #1,2,5,7 cyls.
EXHAUST #1,3,4,8 cyls.
Now turn the engines timing mark only one revoulition, your now on #6 TDC you can now adjust the INTAKE #3,4,6,8 cyls.
EXHAUST #2,5,6,7 cyls.
Now the adjustment on a motor that has been run I back the nut off the rocker until the pushrod has some up and down movement, I then turn the nut in till I get no movement and go one quarter to one half more and then I'm done. There are more varitions to this but I think you will be fine with this information. Again if you already have known of this before sorry. /forums/images/icons/grin.gif But I do hope this helps.