You will need feeler gauges to properly gap them
Take off the valve cover
Remove spark plugs
Set cylinder #1 to TDC
The start on cylinder #1 lifters and cam lobes. For the intake cam, slide the .003" feeler gauge between the cam lobe and the lifter. It should be about .003" gap but not more than .005" Basically the .003" feeler should fit and the .005" shouldn't. If any of 4 them are off any either direction, loosen the jam nut and tighten the adjuster screw until you are in the sweet spot between .003" and .005". The exhaust cam is the same way, except the lash should be .006"-.008". Once you are done adjusting them, tighten the jam nuts back down and make sure to recheck the gaps. They can turn slightly when tightening the jam nut and throw off the lash setting. If they are all in the sweet spot, then move onto cylinder #2.
Adjust #2 to TDC and repeat the process. Then the same for #3 and #4. Each cylinder must be done set and the valve lash gapped indepently at TDC
Keep in mind that those specs are for a B18B1, which I'm assuming you have. B18A1 and B18C's are different