US Mag Indy wheel question

This is a pic of the US MAG 15in sbp with a 255/60/15 M/T ET STREET S/S with only a 3in 6 leaf lift spring plenty of room between tire and spring iffy on fender lip this is on a 64cuda


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Since the 67-76 rear wheel opening doesn’t have the radius that a Demon/Duster has.. I know it’s a limiting factor.. just didn’t wanna find out the hard way lol