If it's a full dressed block it'll weigh in at about 535 to 575 pounds depending on if it has w/alum. intake or not. It will even less w/alum. heads. So unless you want to be picking your balls up off the ground when you do it I wouldn't even think about it.
That is unless you're about 20-25 or so years old & have the muscle to do it.
I know when I was in my 20's I could do it, but now a days I ask for help w/just the heads, unless I'm having a really good day & even then I am very cautious.
My advice even to the young ones here & I have said it several times.
USE the K.I.S.S. method "Keep It Simple Stupid" and my advice is use a chain hoist..joe