1966 Plymouth VIP with a 400 engine running hotter than I think it should. What could be the reason.

My 66 Plymouth VIP 283 was replaced by the previous owner with a 400. It is probably 1970-72?? but that not the point of the post. The point is this engine runs hot and I have had every thing replaced new. It has a 26 " new orginaial radiator etc. However it runs abut 200 degrees after about 10 miles of driving. I have read most of the posts concerning engines running hot on the forum.
Here is what I have done to try and analyze the problem.
1. Checked the in car gauge against my infrared...

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Author: rsh1966vip