Not Ranked
Yeah, I think that's true. The 70 and into 74 are tall decks with more webbing material. I have a 70 block that has bosses cast into the webbing for four bolt mains though only two bolts are actually drilled and tapped. Also the webbing is machined flat all the way across the mains instead of rough casting as in later blocks. They are all probably within 10 to 15 lbs of each other and wouldn't matter much in cars like ours.
Just for giggles, do you happen to know the weight of a Dart cast iron 351W block?
I always wondered how much difference there is between the Dart and production blocks.
Larry
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