You may need to upgrade to the Z/28 valve spring. The stock spring is only good up to .450 lift last I read. Course I have Also read that the stock spring is good up to .500 lift. Something you may want to look into. But for a stock engine all around that cam will do nicely.

1966 C10 292/tko600 http://67-72chevytrucks.com/vboard/showthread.php?t=596643
1964 C20 292/sm420