The P337 is a 5 hour airplane with an hours reserve flown at 65% power, you won't do 1400nm unless you have a really strong tailwind. How much you need to carry? A 148 gallon P337 won't hold over 500lbs in the cabin when full of fuel, some will hold less if air conditioned and with intercoolers for example. There is a 1977 P337 for sale with Dan Howard in Tulsa, asking price is $115K.
https://www.controller.com/listings/...77-cessna-p337