rockers
Why just rockers? There are better ways to spend that money.
If he insists, Comp ProMagnums are a good choice. Be advised that the stonger ones have 7/16 dia studs (vs. 3/8) and need guideplates and new pushrods. Increasing the rocker arm ratio to 1.6 from the stock 1.5 may give a little power, but it's not worth the money if you aren't changing the cam, springs, retainers, locks pushrods(as mentioned).
Contacting a good LT1 valvetrain guy would be a smart idea.
Jon

