Ideal oil temp is really based on the oil you are running and what weight. I would shoot between 180 to 200 as a target personally.
Blocking off the entire core will not hurt anything. Your driving style, length of trip, ambient temps and other variables will determine how much core to block off. I would start off by blocking the whole thing. Then, as you determine you need it, uncover a row at a time.
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Whtfairladyz formerly Dustin@Z1 
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