The Comp 1621 rockers work well. The least expensive aluminum rockers I would use are the Mancini Racing made by Harland sharp.

Mancini rocker arms

With Stealth heads and 1.6 rockers or 3/8 pushrods you have to grind for pushrod clearance. Even with 1.5 rockers and 5/16 pushrods you sometimes have to grind for pushrod clearance.