That's a pretty tall tire. Taller than the original stock size of 235/75-15.
You'd be better off with a 255/45-20. Longer footprint by 1/2". About a 1/4" taller than the original size. Only 4 revs per mile less than factory. Won't affect the speedo hardly at all. At 60mph you'll be doing in the neighborhood of 63.
http://www.1010tires.com/Tools/Tire-Size-Calculator/235-75R15/255-50R20/255-45R20?ismetric=False
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255/45/20's