Schumacher shims

They would have to go between the metal bracket and the biscuit on the driver's side because they're not going to fit between the biscuit and the k-frame due to the oil pump. Right?

I guess on the passenger side they could go on either side of the biscuit.

I once put a 340 on a /6 k-frame with Schumacher mounts and I just made my own shims, cutting them out of 16ga (IIRC) and stacking as many as I needed.