I’m just trying to find out if the Mace rocker upgrade kit to suit the Buick engine will work with a stage 2 or stage 3 crow cam package?

Only 1.7 higher ratio rockers will work with our stage 2 or 3 Crow Cam Pack. We can supply 1.7 higher ratio rockers. The advertised 1.9 higher ratrio rockers will not fit due to excessive lift. However we recommend standard rockers with this Crow cam and chip package.