Their ads are misleading. They cherry pick the nicest looking kit, but if you read the fine print, it's not what they send you.
They claim the kit has everything you need, but at the end they want you to pay extra for the MC, booster and prop valve and another $200 for 94-95 spindles.
Just piece the kit yourself. For what you will spend with their GT kits, you could put yourself together a m2300k cobra kit.