That is gonna be one super nice ride!!!
Not trying to be a bummer, but are you sure about that tire size vs rim size.
Years ago I had the 35x14.5x15 on an '85 with 10" rims & it was just right.
That's what Interco recommends too
http://www.intercotire.com/tires.php?id=13&g=1
I've seen 14.5 tires on as wide as 12" rims & that looked wrong - like they had to force the tire to seal on it.