measure the spread between the ball joints on your spindles you have now, and go for a walk at the wrecker's. When we were building my boss' late model stock car we wanted to put bigger brakes on it, becuase the buick regal brakes were not good enough. we ended up purchasing some Camaro spindles from the wreckers, they bolted right in, but the spread was around 1 1/2" more. we ended up using a load of shims trying to get the camber back to where we needed it, but man what a difference.

Keep it shiny side up!