I have owned my '70 1600 since 1984 in upstate New York. I purchased the car from the original owner who was a proffesor at Cornell. The vehicle has spent its entire life in upstate New York. (you want salt, we have salt, salt, & more salt!) When I bought the 1600, I had to replace fenders, rockers, & wheel arches. The rest of the car was solid. I drove the car for 3 winters & I had to replace the same parts plus some floor panels. I then refused to drive it in the winter. The 1600 was restored in the early 90's & looks as good today as it did when it was finished.(When I can figure out how to upload photos I will). My advice: Don't drive in the snow & salt! My 1600 was rustproofed new & again during the first restoration, It still rusted! There is no way you will keep rust off that car if you drive it in the salt. Been there, done that! If you are not really concerned with it, drive it. I wanted to preserve mine so I bought winter beaters ranging from VW's, to Mazdas, to a 1970 Buick LeSabre(Ouch)! But it preserved the 1600 and I am a proud 27 year owner of a 1970 1600!
(It is still my favorite car to drive!) Good Luck!