Tire height helps with a stiff older suspension. Anything less than 40-45 series will seriously rattle your bones and your old car.
I agree that 235 is very narrow for a 9inch wheel. I have 245s on an 8 inch front wheel and the fit is perfect IMO.
275s are a little on the wide side for an 8 inch rim, but they work. Just not my cup of tea.
The 275-60 on 8 inch welds was my exact setup in the rear when I purchased my car 4 years ago, but obviously Ive since changed.
Got pictures in this thread....search back to late December 2009 through January 2010.
PS
October 21, 2009 are pictures with the weld prostar wheels and 275-60-15s