Anyone Use 275/60-15 BFG TAs with Cragar Series 61C Cragar SS on Their Duster?

Tim, 275's are too big for your 74. Yes there is a size difference. You can get a 255 in there, but measure first, and most likely you'll have to roll the inside lip or cut it out of the way. It's close. I use 245/60/15's on my 74's. They fit really nice. Here is a Pic.

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I've never had issues with 275's on 8 3/4 rears and 4.25 backspace wheels but this 74 is a different animal. Like you said, this 74 has a good sized inside lip on the qtr. I know 275's won't clear the outer lip but what about the leaf springs from the inner perspective? Thanks !!