I did a quick check on the rear wheel. With the car on the ground it didn't rub anywhere, but there was no space at the fender for travel. That would be a lot of fender to roll, but looking at what Truegearhead had done, I'm not scared to cut the 'excess fender' off.
__________________ I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
You're going to need to cut 4 inches to clear those tires. Smaller diameter tires will be a lot more fun as they're lighter and make the car quicker to accelerate. You'll have a harder time getting the rear end to swing out and just have a slower car with those tires. Generally the tracks here in this region pack down and are more like wet asphalt than muddy road. In my opinion those will be the worst tires for having fun or being fast.