I'm thinking it's probably pretty darn heavy...maybe 500 pound range. The iron block is pretty stout. The problem is, where do you stop weighing stuff since you could also include the IC system too. Oh, my figure is just a guess BTW...I don't know specifically.
If anyone has a real number, I'd be happy to post it up on my weights page at the Hardtop Supra Registry.
Yup, still looking. My V8 that I took out of my car is aluminum block and weights around 390lbs...the only info I managed to find on the 2JZGTE shortblock weight is here: http://www.moreboost.org/weights.htm
I would still like to find out about how much whole thing weights though.