I think the issue is with the Wilwood brakes. I'm using the MagnumForce 2" drops on my 69 cuda with Dr. Diff's 13" front Cobra brake caliper kit along with using a 17" Centerline rims with 5" backspacing and everything fits like a glove (no spacer needed). This set up allows me to use a 235/17/40 tire without any rub issues or steering contact issues as well.
