Biggest tire on 67-69 Barracuda?

1969 Barracuda
Rear 15x8 4 1/2" backspacing with 275/60R15

I've been messing with spacers on the rear. I think I have a 3/16" on the passenger side and 1/8" on driver side. This gives me close to 1/2" between tire and leaf spring. The tire also clears the wheelwell lip. If you were to trim/roll this up this it would gain you a little bit. Can see to much more that 275/60 tire fitting without modifications.

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295 650 15 drag radials / top . 295 60 d15 treaded slicks / bottom .

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