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.

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