I am guessing it is somewhere in that 300 +/- 50 lbs range. More than UPS or Fed-Ex will handle, so you are looking at an LTL carrier.
My 354 bare block weighed around 275-300 lbs. I strapped it to a hand dolly and put it in my Subaru Outback to deliver to the machine shop. BTW, Each head- with valves & rocker assemblies- weighed 74 lbs. Hope this helps.
Scott Jay Smith weighed one out on his scale in 2021 https://www.jalopyjournal.com/forum...haust manifolds totaled 16lbs with heat riser. 211 lbs is what he got. Without air cleaner or generator or other bolt on items that didn't make it run it weighed 699.
Not sure where some of the wild guesses come from...a bare block weighs 190-200. The variation comes from which foundry it came from. Yes, I have weighed them because I have shipped them.