I just stuffed 325 50R 15 NITTO 555R's under my '70 'Cuda with 10 inch wide 5.5" backspaced Ralleys, a b-body rearend, Dr Diff's 1 inch inset hanger kit and Caltrac Monoleafs. It's tight, but nothing rubs through the whole range of travel,and I didn't have to roll the fenders. It fills the wheel well nicely.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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