We usually run 10gms on the nose and 10 behind the bellcranks with near bold tyres and it's just perfect ... even lends itself to a little handbraking into corners
I do have a few spare link blocks but its an easy fix if your screws are coming loose, just drill the holes a little deeper into the block, a 2.3mm drill bit is required and then screw in, should be fine, mines an original with no problems .....