Those numbers look alot like ModMax numbers with that crazy .575" exhaust lift. The duration numbers sound OK as they aren't too far off from my Comp 270s, but that high lift number would worry me about PTV issues. Also, if they are Mod Max cams, there have been alot of guys break the valvesprings on the exhaust side if you check about this over at Modular Depot.
EDIT: BTW, I just Googled the part number and they are ModMax cams.