Yeah, some, some A-bodies are light right off the bat, and some need a pat on the back.
My Dana is lighter than most, but still an anchor and combined with the 12 pt rollbar is adding an extra 100 pounds or so, but it's insurance.
Dr Diff went to great lengths to shave off some ounces here and there.

Maybe some aluminum drums will find there way into production. Wishful thinking unless you go the GM conversion route.