Dropping the rear of my 64, what to use.

I run 18s on a 64. if you want to see that look check out my pix. Also, for ride height adjustability you should look at an air ride set up in the back with the 4 link. RMS makes a 4 link that bolts in but not sure if it will work with the air ride set up. The triangular 4 link I use comes from air ride but requires fab work on install.