Yep, not much weight difference between any of them. A few pounds here or there at the most.
Pontiac V8s are pretty much a modular design, the heads and blocks share the same external dimensions on all of them.
About the only thing I can think of that may add a scant few extra pounds would be the longer stroke crankshaft in a 455.
The thinwall cast short-deck 265/301 'economy' engines with their non-counterweighted cranks are quite a bit lighter than the other Pontiac V8s.
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