i just dont know about the natural-A situation. ive seen alot boost put to LS blocks. and they hold up just fine. i kinda feel if you put this much money into a hotrod than you shouldnt be to worried about cost. im worried about goin faster. and i belive in the weight saving deal. if im gonna spend a couple grand on a block than im gonna get the best i can. its not how "reliable" can you make your hotrod its how FAST can you make your hotrod.
aluminum=less weight=faster=