Lend me your experience

I should add, I have a backup motor (1973 360 block) That was in my Dart when I bought it but I have confirmed that it has been opened up at some point because a lot of parts are mis-matched throughout the engine. If there is anything that you think I can pull off of there to compare to what I have in my current engine, I am open to that.
For example, I am considering pulling all of the pushrods out of both engines to pick 16 of the most identical ones in length to try and equalize those measurements. Any other ideas?