yes dave if there are 2 in block in the rear they are definitely compromising performance with that large of a block you have a good chance of getting axle wrap. with block is recommended to not exceed 1" for performance driving. what size tires are on the front now? if they are 235 40s then getting the new tires will raise the front almost .5
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AJ
1970 1/2 rs z28...pro-touring?...i wish...soon?
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