rocker shaft shims???

I had my machine shop deck my block on my 318 .015" and my heads .020" for a total of .035".. My question is, Do I need to shim my rocker shafts .035" to correct the geometry or is this to little to worry about?? Also is it absolutely necessary to mill the intake side of the head when this is done if I don't use the intake end gaskets and use RTV instead?? thanks