The OEM type pick up, like the one you link to, is supposed to have a slight interference fit and contact the pan's floor.
Do you run a windage tray? If you don't, get one. The thickness of the tray and extra gasket may give you the clearance you need.
Three other options;
1-Add more threads with a 3/8" pipe die and trim the end so you can screw it in further.
2-Bend the tube up.
3-Buy a better pan, with matching pick up, that holds more oil than the 4qt one you have, yet doesn't hang down like the 8qt 7" deep pan, that's the MP repoped 6qt '70-'72 440HP/Hemi pan.