Aluminum is light, easily repairable if windowed, and you can resleeve if you hurt a cylinder. The ONLY downside is the cost.
Cast iron is heavy, it's a boat anchor if you window it, sure you CAN sleeve it, but not like an aluminum block.
In my opinion, if you have the money...there is only one way to go. That's why I have a KB block in my cuda. CHIP
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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