Semi-serious self inflicted wheel screwup

[oldguy668]

Back story: I bought a really nice set of 15", 30-spoke, old school wire wheels from a forum member. No problems with the wheels at all. They look great with the fat Mickey Thompsons I bought. The 10" rears were supposed to be 4" backspace, so I had the rear end narrowed 2.5" per side, and it looks like a 1" bolt-on spacer will make them perfect, so the real backspace is probably 4.5". No big deal. The fronts, however, are a different story. FFR wheels are 9" with a 6" backspace. My front wheels are 7" with a (allegedly) 4" backspace. So if the wheel is 2" narrower and and has 2" less backspace, the outside lip should be on the same plane for both wheels. Not quite. The fronts are sticking out about 1.5" too much, and I already have a slight negative camber. Will switching to pin-drive lower control arms and moving the upper control arm mounting to the horizontal holes give me the 1.5" I need?

Wheel fail.JPG

I have the newer style FFR 2-piece spindles which do not use adapters. Do I have to change both the spindles and lower control arms or can I change just the arms?