I'm doing a custom mini-tub on my '69 Camaro and am wondering how do I determine what size tires I'll be able to put on once I'm ready. Where and how much clearance do I need between the tire and the inner/outer wheel wells to prevent any contact? Is 1/8"-1/4" clearance between the tire and fender lip plenty? Is 1/2" clearance between the tire and inner wheel well enough? Anyone have any recommendations? Thanks.