Re: Tire growth
On my 69 & 70 Mustangs, the tight spot was at the front of the wheel opening, mainly from the rocker panel to about 1/2 way up. Personally, I would like more clearance than you currently have, but if you will be running a radial slick, they tend to grow much less than a bias slick.
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NHRA 6390 STK
M/S 85 Mustang
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