Motor size?

Going to look at a Ramcharger today,friend of mine told me about it.He does not know fore sure what year or motor but smallblock and early 70's.Motor has aftermarket int and carb,says body is sad but price is right,going to use motor and part the rest if I get it.Question is where exactly do you look to find the motor size?I know where to look on a bb but haven't really messed with sb.