Hey folks,just joined and really like this site. I have a 66 Coronet 500 and want new wheels and tires. Before I spend the $$$ I want to make sure I get the right stuff. Want 8" 15's on the back and 7" 15's on front What is the biggest tires I can use without modifying or rubbing issues? Thanks in advance

66 coronet 500 convertible 440 mag/727/2500 stall/323 rear/430hp