Rick, maybe I'm brain-damaged, and don't get me wrong, I like the alum. block, but if we know original 427s came with alum. intakes, why count the 50 lb. weight difference?
I can believe the difference in total weight is 200#. If that's what it is--that's what it is. But you are counting the weight of an iron intake in your figures.
We'll have to weigh-in when Jamo gets his done. His aluminum against my iron. Oh wait, maybe the cars will still weigh about the same with drivers' weight factored.
Sorry, Jamo.
BTW, my Contemporary weighs 2500. I do run an aluminum flywheel also.