The problem is a 15x7” with a 4” backspace also has a 4” front space. The 235/60/15” is 9.5” wide on the section, so you’ll have .75” of tire overhanging the rim. So you’re up to 4.75” out of your ~5” from WMS to quarter lip, or down to about 1/4” of clearance from the widest part of the tire to the quarter.
It won’t rub sitting still, but I’ve found that for most street driving situations you probably need more like a 1/2” to the quarter lip if you don’t want any rubbing at all. Less than that means you’ll probably get some occasional rubbing. But of course that depends on how you’re driving the car, where you’re driving the car, how often you put people or stuff in the backseat etc. For my car I want to be able to go to Costco and load my trunk full and then drive a mountain road home and not worry about my tires rubbing. But that’s a higher standard than someone that just putts down to the Dairy Queen once or twice a month when the weather is nice needs.
Stockton Wheel was always kind of “interesting” to deal with.
Wasn’t there just another thread about someone having a set of steel wheels modified? I’ll have to look.