I just finished doing the shelby drop, and cutting the front springs on my 1970 Mach 1. I had shims on the control arms. I noticed, after reading some threads on this forum, that 70's wasn't supposed to be shimed. I'd appreciate any information on this subject. Also if there is anybody in the Okla. City area, that knows of a allignment shop in this area, that's good on muatangs, please let me know. Thanks Jim.