I had the EXACT same ROH ZR6 wheels as my first set. I also had 245-50-16's.
http://216.59.112.100/~drudis/stuff/mustangall/
Later, I went with softer compound tires for open track events, and these were 245-45-16 A008RSII's.
You _may_ have some rubbing, but in my opinion, you can easily avoid this. Even on my lowered car I had to be careful, but it was ok.
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Darius Rudis
Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page