According to the Goodyear site the tire is intended for a 7" rim
http://www.racegoodyear.com/products/racect28.html
... so you are probably won't gain much going with the 8". That said, I used to run Hoosier 23x9.5x15 on a 8" rim with decent results.
If you can afford it, you will see a big improvement if you get away from the cantilevers and go to the square wall slick on a wider wheel. But you probably knew that.
Tom
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