I've put 17x9 ZR1 wheels on my '71 Nova. I used 2" spacers on the front (245/45) and a combo of 1.5" and 1" for the back to get the 275/40's under the back.
Because these cars are all a little different you'll have to measure to get the right fit, in my case, even side-to-side in the rear.
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