I think it is cool of you to share what you know with some younger guys just starting out. I am tech challenged, but have considered doing the same thing with the video on youtube. I worked with a kid buying an engine from me and we built his engine together. Not just final assembly, the whole shebang.
Takes a lot longer but I like teaching like my Dad and his friends did for me. He now gets it that it takes the average guy a weeks time to find a good core, teardown, inspect, and clean, take parts to machine shop to be checked, clean measure and inspect internals, locate and order GOOD parts as needed, etc. It isn't just an afternoon job slopped together in a couple hours.
I told him if you won"t eat off of the part it does not go in the engine.
There are still some good cheap big block cores . Just have to know where to look. Why do you think all those motorhomes and C bodies were built? :)