Im going to get a set of new vortec heads from summit. I am going to use a hydraulic roller camshaft with .502/.51" of lift. Duration at .050" lift is 224 int/230 exh. What my question is here is what do I need for springs for that cam and lifters? The lifters will be stock GM roller lifters. Will I need to buy a new spring set and install them? The heads Im buying are the ones that summit already machined for up to .550" of lift so that wont me a problem. Does anything need to be machined for the use of dual springs?