The factory spec for bias-ply tires is 0° to +3/4° camber. With radials, you want around 1° negative camber, which is going to make your situation slightly worse (maybe). I'd just leave the spacers in there, assuming they are fairly thin (1/8"?).
-1* of camber is fairly aggressive for the street, especially if the radials you're talking about are the BFG T/A's that most folks run.
For a street car with 15's and BFG's I'd set up more like -.5* camber. -1* camber is pretty much the most you can run without seeing camber wear on the tires. It's what I run, but I also have 18" rims and more modern tire compounds and design.
