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When I built my hemi, there were no iron blocks available and KB or Indy were the only 2 choices. I went w/ KB and couldn't be happier. Should be the last block I'll ever need to buy...repairable if it blows up, mess up a bore just install a new sleeve, etc. Not to mention saving a little weight up front.
A LITTLE WEIGHT?!?!?!?! 
Well, my car's a sled so yeah, it is a little to me, lol.  I didn't really lose any weight when I put the hemi in...turns out my all aluminum hemi weighs nearly the same as the iron block/aluminum head 440 it replaced.
Now imagine an aftermarket iron HEMI block. 
I have one of those too...an iron World block. It's on the engine stand now and man is that thing heavy! It was 4.25" bore when I got it...decided to take it out to 4.5" bore. One reason was to take some weight out of it, lol.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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