Is this a Lincoln Continental or a Mustang convertible?

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closest That I could find ...(https://www.streetsideclassics.com/vehicles/4056-nsh/1971-ford-mustang-convertible)

To get your best price you are going to need national exposure.  An auction, eBay, etc. is going to be your best bet.  Fees will eat into the eventual price some, but you have to balance that with the higher price its likely to bring. 

As far as price I would look at all the options, color, etc.  You're going to have to temper everything with the fact that the '71-'73 body style is nowhere near as popular as the earlier cars, but this also creates a secondary market for guys who may be priced out of the '65-'70 market.  I think it being a drop top also helps.  351 doesn't hurt either.  An appraised value isn't a terrible idea, but that's more geared towards replacement cost for insurance.  In the end, as all things, its worth what someone's willing to pay for it. 
 

Craigslist may do better in certain locales.  Around here it gets very little traffic.  Most people have transitioned to Facebook Marketplace.  eBay still garners a national audience, just be aware of the fees.