This is a Comp Cams custom cam designed for a 396 LT1. The lobes are the Magnum lobes that have a little bit slower ramps than the XE lobes. It's very similar to a CC306 but with more lift. I don't have the cam card but these are the specs:

Intake: lobe #3122, adv: 290, .050: 236, lift w/ 1.6: .608
Exhaust: lobe #3113, adv: 304, .050: 242, lift w/ 1.5: .588
LSA: 112 deg, ICL: 109 deg (3 degrees advanced)

It's a cast core, and fits a 95+ opti. You can use it on an earlier LT1 by trimming down the pin a little. It has under 3000 miles on it.

Looking for $150 + shipping.