They won't fit because your wheels don't have near enough backspacing.
You need about 5" of backspacing with an 8" wide wheel, if those tires will even fit on an 8" wide wheel. If you have a 10" wheel you'll need to do some measuring. Even with perfect backspacing it will be a tight fit.
Please don't cut up the fenders/quarter panels on an old Pontiac just to fit big ass tires. Maybe mini-tub it instead?
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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