Seems to me while working on air flow might lower your temperatures it's really not the root cause. Your set up doesn't look bad, I think there's something else going on that is getting your temps that high. Cruising down the highway just doesn't take that much horse power to do so you aren't making that much heat regardless of the engine size.
I'd be going after the basics first, it will be much cheaper and better for your engine longevity if mixture or advance is your problem and you address that.
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