Hi Douglas, there are no guides as such, what i normally do is fit them as they are, drive up the road and see how harsh the vibration is, it very much depends from engine to engine as well, some "less well put together" cars can vibrate all over the place (loose dash screws being a common one).

If it's too harsh then i recommend drilling 3 lateral 10mm holes like this....



Do it to one mount at a time, test drive and see what it's like.

You can add more holes to fine tune but there will always be more chassis vibration over stock mounting rubbers using poly ones, but i much prefer the mroe solid engine feel, the stock mounts allow the engine to rock about far too much for my liking.