Im almost 100% sure after doing some reading on these blocks that the main difference in the block is also the same difference in the intermediate shaft. If you swap using the Z series motor, make sure you get the intermediate shaft that goes along with it, which almost makes it not worth investing because there either very hard to come by, or they cost a fortune brand new. But these motors are still pretty much drop and crank motors. I do believe your right about the oil coolers aswell... Which for some people sucks...
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