Engine Mounts

[downtell]

I have a 68 and just put in a small block 408 into it.  It seems that I do have a problem with the motor mounts.  Essentially I have too much play in my motor mounts and my header is resting on my steering gearbox.  The question I have is that are there shims or spacers that the mounting bolt will go through in the lower portion of the engine mounts (the one that mounts on the frame) that will stop this?   Thank You, Joe.