I found a guy selling brand new sets of valve springs, retainers, and locks on ebay for about $70. Says they're good up to .540 lift and will fit directly on my GT40P heads. He says they're off-brand, but come from the same parts bin as the crane springs do. I'm considering buying them rather than the $113 crane kit. Any thoughts? Anyone bought these before? Oh, and i'm running a TFS 1 cam.