Comp's "Nostalgia" cams came out a couple years ago, but never got a big splash. I think Summit used to offer them. I could never figure out how they could offer the performance of the older cams with newer technology, i.e. different grinds. Maybe I missed something.
Anyway, I believe the 300hp factory cam was just the old "929". I've found a good replacement is the "151" mentioned above: 222/222 @ .050 and .447 lift.