Hyd Roller cam
What power level are you wanting to upgrade to? Any other changes going to be made to the engine?
All the components need to play nice with each other.
Suggest you list your compression ratio, intake manifold, carburetion, headers or stock exhaust manifolds, trans type (auto or manual), converter stall if auto trans, rear gearing, suspension mods if any and estimated vehicle weight in order to give our online techs enough info to make a recommendation.
Also, what is the intended usage? Street only, street/strip, etc.