Looks like you have added wider wheels and tires. While the '57 Ford wagon has a larger wheel well, inner fender specifically, than the coupe kit, it still is really tight and doesn't leave much room in there without enlarging the wheel wells. Might want to check clearance between the wheel & tire with the suspension and wheel wells. Any minor tire contact, usually hard to see when mocking up the body and chassis, can give you fits. I'm fighting that same battle on an AMT '57 Chrysler 300 build and finally just back off on the tire width and solved much the same problem.