245/60/15 on 66 Valiant

Hi guys,
I picked up some 15x7 steelies with a 4" bs. For my 66 Valiant Signet with 7 1/4 rear end
I am hoping to put some 245/60/ 15 on the rear.
Before I pull the trigger on them I would like some input from you guys. Has anyone run those on their 63-66 abody without mods?
Thanks