Originally Posted by grantv

Dropping a cam in is one of the easiest / cheapest ways to add a healthy dose of power, that's why so many do it, or recommend doing so. And most love that rough idle, some want a cam almost just for this reason.
No other upgrades are necessary, but supporting upgrades to assist breathing (intake and headers,
and you will need a tune) are really advantageous.
You can get a cam suited best to your mods however, and it need not have a rough idle (although iit likely will be a bit more rough than stock, even a stock Z has a bit of chunk).