Im not sure what you mean by an alloy block. Im pretty sure that what you are referring to is the sandwich plate. In which case, yes, you can remove it but you wont have an oil cooler anymore. You will also have to get a filter mount "bolt" from a non-oil cooler fitted 4A. The 4AFE or 4AC are two easy solutions.
What you can do, at a later date, is to replace the oil filter down there with a remote filter kit. Much more effective, and lets you run a bigger cooler and place the oil filter in a non idiotic location.
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