66 mustang tire question

Hey Guys,

I am going to put a set of 14 by 7 inch magnum 500's on my girlfriends 66 mustang. Can the fenderwells handle a 235/60/14 tire? If not, what is the biggest that I can run? Right now she has a 195/75/14 on the factory 5.5 inch steel wheels with hubcaps. The wheels have 215/60/14's on them now and they look a little too small for me. Should I go with a 70 series sidewall instead? Maybe a 215/70/14? Any help will be appreciated. I know that this Q has been asked a million times but I could not find anything in my searches. Thanks!
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