A bodies in Wisconsin, Who's out there?

Onlooker said
I'm new to the older car but have had mopars my whole life. Here is a pic of my 2 cars. The Reliant runs a 14.0 on street tires and I just got the Valiant so that is was brings me here. I live just south of Janesville. I plan moving the springs in but don't know if I want to minitub it, the trunk is so clean I would hate to cut it up. How bug of a tire can fit without moving the wheelwell?
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Someone correct me if I am wrong but I believe with just using the offset spring package (which gains .8") and the correct offset wheels, you could get a 255/60 in there and maybe one size larger. That way, you shouldn't have to cut up the wells. Granted, it depends on what is going in there and what kind of rubber you are going to need.