I'll have my 68 sitting with the frame and exhausts 4" off the deck.
This will be it's ride height.
As others have said, takes some time and $$
Full custom 4 link rear with this ride height in mind. Custom tubs to allow enough rear wheel travel in the tub sitting that low.
AME from end with the top of the shock mounting tower raised 1.5" as standard from AMR would have only given it 1" of travel at that height, now it has 2.5" of travel.
As said it can be done, but it ain't easy.
Here is a pic of mine at ride height. Note front will be lower it's sitting up as all front sheet metal etc is off the car