If I were gonna go air, I would build a custom chasis. C-notch is good but not necessary if you're doing a flip with GOOD springs. Lowering spindles and 1 inch drop coils look just right imo. If you really want to slam it I would do air but be prepared to be very invasive and creative. I think it's ugly to have anything permanently mounted or protruding through the bed but that's just personal taste though. Do what's right for you but think about what you want it to be in the end before you start.