Water pump shims?

I have an interesting problem. When I tried to install my Weland water pump on my 327, the water pump "arms"(the ones that are bolted to the block) do not make contact with the block. The base of the water pump hits the timing chain cover(aluminum). I grinded down the small bolts on the base of the water pump but still, no luck. Have any of you guys had this problem? It looks like some shims would fix the problem but I could not find any. It is about 1/8" from the block. Thanks