What's a good cam to hit low 12's

Not that that price!! Custom is way to go for about 50 more than a shelf grind. But youll need to know about every parameter of your car. the more you provide, the more honed the cam will be to provide what you want. they are so tuneable that it may provide peak hp like a motor build off contest motor that will suck on the street or a broad torque base that will kill it on the street but may not be track worthy. Its really a tough one to answer with a part number alone.