How do you get it up?

Its a little tougher with a Mopar, especially an A-body because of the short front segment of the leaf springs. It results in a short instant center above the squat line, meaning it wants to lift the rear of the body and plant the tire (not a bad thing), but that also cuts down on front end lift. It's a physics thing.
That situation can be changed a bit with Calvert or assassin bars, but if you want a nice big wheelie..... long low ladder bars will do it.
Check out Kevin Wilson's leaf spring tutorial on you tube.