Alan,

The tried and true combo for 69 b-body seems to be 15x8 with 4.5 inch backspacing running 275/60/15 in the rear. The front can vary. A popluar choice would be 15x6/3.75bs or 15x7/4.0bs and 235/60/15. I wanted a little skinnier look up front so I went with 215/70/15 on 15x6/3.75bs.

I went with the new Mickey Thompson Sportsman S/T Radials and liked how the turned out.

http://www.summitracing.com/parts/MTT-6030/

Steve