Do a search on stock cam and you'll find that some members have been as fast as high 10s with a stock cam. Also, most will say that the stock cam is the most reliable unit. So, if yours is still good, it would be best to leave it alone. Remember, this is not a chebby engine we're talking about (no offense to you Chevy guys). My cam had had it (after spinning the #1 rod bearing, so I replaced it with an aftermarket (during my rebuild), but would have gladly used a stock cam if it was still available (new).