"Gorgeous car! That stance is pretty much what Im going after. Do you get any tire rub at all? Are you using a camber compensator on the rear? Is the front ball joint or link pin? Stock width?" - ExtremeBean
Like Ted replied, swing-axle rear (narrower than IRS), adjustable spring plate, 2" drop spindles on ball joints. Don't have compensator or sway bar on the car (just a cruiser).
With this wheel & tire set-up (185 x 60 x 15) no tire rubbing at all (rear tire to fender clearance is about 1/4"). All four wheels have 3.75 back-space, primarily to accommodate rear set up. However, with that wheel back-space in front, the inset of the wheels in the fender well looked like I had narrowed the beam. Didn't look right to me, so I installed 1 3/4" wheel spacers (hub centric) to push wheels out.
The dropped spindles added about 3/4' wider track on each side, so the 1 3/4" spacers put the wheels right where I wanted them for the lowered stance I was after. 
Click on pic to enlarge...