It depends on so many factors, you will really need to do more homework. The engine and options are a start. What you call "mint" and what collectors call mint are likely ot be very different. Is it all original, or has it been restored? How well was it restored? Whart documents to you have regarding it's provenance?
It could be worth anything from $10,000 to $1,000,000
I am guessing this is a joke, though. No one comes across a first-year Mustang in "mint" condition without knowing exactly what they have.