Recently I've swapped the 7.00x15 split rims for tubless radial 16.5” wheels. There were two like new 9.50R16.5 tires with the rims so I used them on the rear. For the front I bought new Cooper 8.75R16.5 tires and they are the same height as the original bias plies with the intention of replacing the 9.50’s with the smaller 8.75 tires some day.
My running boards have over 12” of clearance, a little more with the bigger tires on the rear. I have no trouble with fender or frame clearance and can change the tires by just jacking up on the axles.
Here are a couple of pics, just scroll forward.
http://rides.webshots.com/photo/2780229790098611668IHElAc Denny Graham
Sandwich, IL