The procedure as given by Mr. Yount.
Be sure the pair you're installing have the lifters on the base circle of the cam - in other words, both valves would be closed if the rockers were on. Hand tighten them to zero lash - with one hand rock the rocker while tightening with the other hand. Once it barely stops rocking (no gap on the pushrod end or the valve stem end) you've reached zero lash. From that point, torque to 18-20 ft-lbs while counting the number of times the bolt turns. It should reach that torque somewhere between 1/4 turn and 1 turn. If it takes more than 1 turn to hit the torque when starting from zero lash, then shim the rocker higher. One .030" shim will reduce the number of turns by about 1/4. If it hits the torque in less than 1/4 turn - you'll likely have a hard time getting it to zero lash by hand, or to zero lash at all - you'll likely need longer pushrods. If it hits the torque just short of a 1/4 turn, you may be able to 'shorten' the rocker by evenly removing some material from the bottom of that rocker's fulcrum. Unless you've replaced the cam with a different one (sometimes replacement's have a slightly smaller base circle) you probably won't run into needing new pushrods.
Once you've installed each pair this way (you'll have to turn the motor over by hand to get each pair of lifters on the cam's base circle - follow the firing order to minimize hand cranking) and cranked the car, if they're noisy, you may have to go back through with everything good and hot (or at least warm) and re-install. The clearances change slightly when things are warm, and I've found that any noisy ones I've had generally quiet down when I do the install procedure warm.
Note that the rockers aren't really adjustable. The install procedure is there to tell you if things are dimensionally the way the should be in the engine. You can just torque them down - but then you won't find out about any potential dimensional issues until you crank it. And then, occasionally, you can find out about them the hard way.
P.S. why wont the cam be fun? I have gt-40 intake and a few other pieces will it not give me power over stock?
except for the ones with the valves open of course. This is getting fairly upsetting. Do I need longer pushrods or what?? There is about to be an 89 lx with a non-running new 306 on the market!! 
