TwistedPhil
+1y
That's what notching is, but I'm not sure you'll have to do it on your '79. The '71 has a different frame underneath it if I'm not mistaken.
The best way to know for sure is to take your shocks and coils out, jack up the axle, and see if you have enough drop to hit the ground!
If something stops you from going all the way down, get under there and see what it is- and get ready to cut it out of the way!
-Phil