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In my opinion, if you are going to put on a belly pan don't extend the existing chin spoiler at all.
However, if going chin spoiler alone as I have done on my S-10 pick-up truck (see link in signature below), I have found 7-1/4" to be the magic clearance height for most shallow curb stops, raised sidewalks and snowfall in my region.
7-1/4" happens to be the height of a nominal 2x8 piece of lumber which you may want to use as a guide.
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