SpaceGhost

Good day, I have a 1997 Miata which is stock except for the wheels. Its an automatic transmission which I plan to swap for a manual. I recently saw a S14 for sale by me for $3500. I like it but I paid $600 for my miata and it needed work but it was a running car with a good engine. The S14 is manual and it runs, but it has a few rust holes in the car, frame rails aren't rusted BUT they are caved in on the rear side. I have some pics of this car. Idk how much these cars are worth, is this a fair price ? Would you keep the Miata or go with the s14? Any advice is welcomed, thank you.https://imgur.com/a/DL5wYpb