Your only chance at finding one without a sunroof is going to be an SR5. The only limiteds and sports without sunroofs are going to be ones that were special ordered from the factory and there aren't many.
Thanks for making me feel special on a Friday afternoon! I have a V8 SportEd with no sunroof.
I am 6'4'' too, when I was looking to buy mine I sat in a few with sunroofs and fit without much of a problem. Remember that you can crank the seat down to sit lower and give yourself more headroom.