Front end setup (Drag Racing)

Got a chance to get out to the Garage today. It warmed up, so I did a bit of cleaning in the garage, and pulled the front shock off the right side front.
Loosened that side right up.
The shocks it has is Koni adjustable. The type you push together then turn to change the setting. It was set in the loosest setting. but boy does it hod the front end stiff.
On old shocks, where do you drill the hole to drain the oil?