To give you an idea of price..
Springs,hangers,shocks etc all Old Man Emu cost me from memory around the $2500 all together.
I think I have come across a 80 series rolling chassis which i'm thinking of putting under my 70 with my lex.
This is just a feeler to see if anyone wants them and is willing to make a serious offer for the lot.They work VERY well for the 70 and I'd say is the way forward if you are looking a standard setup but a major upgrade.I get around +450 mm flex but would need to messure to make sure.

Open diff in front
LSD in rear..