I did this 4 years ago. With my 3 speed transmission there was a noticeable increase in RPM and noise. I lost 5 MPH ( when I was doing 55 with the 8R's it was actually 60.) the 225's set the speedometer right on. So now when I'm doing 55 I'm doing 55. I have never felt the handling was any better but the ride seems to have improved. Would I make the change again.. probably not. Also the Hankooks that I bought were considerable heavier.
1990 28' Georgie Boy, 454, 4bbl, Thorley Headers, Recurved Distributor, 8.75 mpg. RVM 76