If you would have described that set-up to me without providing the pics, I would have said it would never work. But after seeing it, let me say, WELL DONE SIR!
Just dumb-luck. I bought the wheels used without a blemish or mark on them off another
Grand National -- that's why I'm not sure if they are 10, 10.5, or 11" wide with 285 30s on the rear. (fronts are 8.5, I think) So that gave me a reference and going by the tire specs, I figured I could go up two sizes to the 305s.
I don't think anyone who is anal would have done what I did. But, I'm not anal.
I'm using 3/8" universal spacers, longer 2" wheel studs, of course, and had to trim my inner fender lip & wheel house molding about 1/4", and installed Airlift airbags, not to raise the body but just to stiffen up the suspension for less travel. Body sits about a half to three quarters of an inch above the tire, obviously can sit no lower, and thanks to the airbags only makes occasional very light contact but I have the inner lip covered with plastic molding (similar to door edge guard but wider and heavier) that protects the tire from any contact, damage, or scrape.
With these huge 305s, on 10" rims, I think that if you ordered custom rims with a 5.25" backspace, they would just fit with no modifications. Mine have a 5.5" backspace, so I had to use approx. 3/8" spacers to avoid frame contact.
