Tape a little 1/4" thick nut to the bottom of the Pickup. Put it on the Oil Pump kinda snug..put it to where it's kinda pointing down so it will make contact with the Pan. Put the Pan on the Engine without the Gasket and make it flush. Pull the Pan off and mark where the Pickup is at, and tack it there. With the Gasket that will be about 3/8".
That's how I did mine.