Too much cancer?

I pulled my 1970 340 swinger out of a field in 1993. The last it was on the road was 1988 according to the state safety inspection sticker. I was lucky the car was 23 years old only sat for 5 it has been in a garage ever since so minimal rust and what was there has been repaired. Now these cars are 50 years old and the longer they have been in a field well you get the picture. Some of them rust bad others not so much.