I'm just finishing up a 67 with 17x12" rear wheels, 6" BS. I had the 12 bolt narrowed to 55" WMS to WMS. Running a 315/35/17. The rear in my 69 is 56" WMS to WMS running 18x12, 6" BS and 335/30/18. Both cars have rolled fender lips. Each car is a bit different, but I have nearly equal space between the tire/fender lip, and tire/inner wheel house. Hope this doesnt muddy the water, just thought it may help for comparison. Scott
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69 RS LS3/T56
68 firebird vert LS1/4L60E
67 RS LS2/T56
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